frank9310
Full Member
Now dig this baby...
Posts: 146
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Post by frank9310 on May 14, 2008 6:37:37 GMT -7
Hey thanks Myles! I'll give him those exact specs. I just ran the Eurotubes bias probe and I see that after an hour wait and lots of playing and turn all settings back down to zero, that the KT66 closest to the preamp on the Route 66 reads 35.2mA and the one closest to the large transformer reads 38.2mA. Does that seem far apart? I'm going to get those other tubes from Doug but just want to make sure I understand what could be happening. They do seem to lack sustain at any mA setting from 32-36mA and something sounds microphonic at times though I've read power tubes rarely go microphonic. I tried tapping them all with the chopstick with no bell tones on any and swapped all the tubes out with others except for the KT66s to see if any one of them could be causing the problem but if I get close too the speakers it sometimes squeals like the pickups need potted and sounds very hollow like in a cave but I know potting is not the case as I tried it with 3 different Strats that never had microphonic problems before. Thanks, Frank Power tubes, especially KT66s can easily go microphonic. KT66s are very fragile. A 10% difference in match is fine and 20% is considered an industrial match. I would be happy with a 3-4mA difference between two tubes in the 36mA range. Well there you have it. I probably caused them to go microphonic as many times as I biased and re-biased them and once one of them slipped out of my hand across the rug because I grabbed it when it was really hot with a Fender polishing cloth. So to wrap it up, if I gave him those specs you mentioned, setting at 36mA and wanted to get as close to the overdriven sounds of Hendrix at Monterey as possible (doing a Jimi Tribute thing) , what specs would you recommend for the other tubes such as the EF86, preamp and GZ34/AR34 going through Celestion G12C Greenbacks as used in the Hendrix JH100 Stack?
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Post by myles on May 14, 2008 8:52:12 GMT -7
Power tubes, especially KT66s can easily go microphonic. KT66s are very fragile. A 10% difference in match is fine and 20% is considered an industrial match. I would be happy with a 3-4mA difference between two tubes in the 36mA range. Well there you have it. I probably caused them to go microphonic as many times as I biased and re-biased them and once one of them slipped out of my hand across the rug because I grabbed it when it was really hot with a Fender polishing cloth. So to wrap it up, if I gave him those specs you mentioned, setting at 36mA and wanted to get as close to the overdriven sounds of Hendrix at Monterey as possible (doing a Jimi Tribute thing) , what specs would you recommend for the other tubes such as the EF86, preamp and GZ34/AR34 going through Celestion G12C Greenbacks as used in the Hendrix JH100 Stack? You have posted a lot of questions on something of a continual basis here and to do things properly will require dialogue on the phone or in person. So ... if you wish to continue with ongoing questions we need to make an arrangement of some sort. I love to help people but there comes a point where I have to point out that this is what I do for a living.
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frank9310
Full Member
Now dig this baby...
Posts: 146
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Post by frank9310 on May 14, 2008 11:31:18 GMT -7
Oops! I am very sorry Myles! I have been reading through your site and there so much info that I was wondering exactly what you do or if you were an amp consultant and from what I was able to read through, I thought you created blueprints for amp manufacturers. I tried to read your bio etc. to find out more but it said to email you for it so I am terribly sorry for any trouble. I'll contact you from your site soon to see if you can consult with me if you do that as a service. Regards & apologies for my misunderstanding, Frank
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Post by ecsong187 (Edwin) on May 19, 2008 18:16:58 GMT -7
Hey I'm going to be getting a RXes soon. I was wondering what settings would get me in the ballpark for Brad Paisley's tone on She's Everything, and Time Well Wasted? Thanks Edwin Song
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Post by myles on May 19, 2008 18:34:46 GMT -7
Hey I'm going to be getting a RXes soon. I was wondering what settings would get me in the ballpark for Brad Paisley's tone on She's Everything, and Time Well Wasted? Thanks Edwin Song Send Chad Weaver a PM or make a post with a title of Chad Weaver as he is on the road and might not see this .... he could tell you what was used but frankly, Brad could have used any of his Z amps ... it's all in his hands
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strat-les
New Member
"Don't play as well as you think you can.....Play better"
Posts: 32
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Post by strat-les on May 21, 2008 19:14:36 GMT -7
I have an old Chandler Tube Driver. It takes 1 12AX7 tube. Could I try an EF86 in it without harming anything? What would be the difference in gain? Thanks in advance, Jim
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Post by Phil (aka Phil) on May 22, 2008 4:09:03 GMT -7
I have an old Chandler Tube Driver. It takes 1 12AX7 tube. Could I try an EF86 in it without harming anything? What would be the difference in gain? Thanks in advance, Jim Hey! I have one of those too!! A four-knob version, signed by B.K. Butler at the bottom? I bought mine new back in the mid '80s at a local music store. To answer your question, no, you cannot use an EF86 in place of the 12AX7. A 12AX7 is a dual triode type tube and an EF86 is a pentode. You can use a 5751, a 12AY7, a 12AU7. A 12AT7 is not recommended for use in this type of application even though the pins of the tube match the 12AX7. The gains are: 12AX7 - 100 5751 - 70 12AY7 - 45 12AU7 - 20
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Post by myles on May 22, 2008 8:17:20 GMT -7
I have an old Chandler Tube Driver. It takes 1 12AX7 tube. Could I try an EF86 in it without harming anything? What would be the difference in gain? Thanks in advance, Jim No ... you cannot do this. An EF86 is a pentode and a 12AX7 is a dual triode.
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Post by myles on May 22, 2008 8:19:04 GMT -7
I have an old Chandler Tube Driver. It takes 1 12AX7 tube. Could I try an EF86 in it without harming anything? What would be the difference in gain? Thanks in advance, Jim Hey! I have one of those too!! A four-knob version, signed by B.K. Butler at the bottom? I bought mine new back in the mid '80s at a local music store. To answer your question, no, you cannot use an EF86 in place of the 12AX7. A 12AX7 is a dual triode type tube and an EF86 is a pentode. You can use a 5751, a 12AY7, a 12AU7. A 12AT7 is not recommended for use in this type of application even though the pins of the tube match the 12AX7. The gains are: 12AX7 - 100 5751 - 70 12AY7 - 45 12AU7 - 20 Phil - next time I will read what others such as you write before I reply! Thanks for the reply to that fellows question.
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strat-les
New Member
"Don't play as well as you think you can.....Play better"
Posts: 32
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Post by strat-les on May 22, 2008 8:21:04 GMT -7
Thank you so much for the info! Mine sounds the same as the one you described. I also bought mine in the mid-80's and I believe I have not done a gig in the last 20 years without it. It's not 'on' all the time- just when I need a liitle more grit. Best pedal I've owned!
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harris
Junior Member
Posts: 65
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Post by harris on May 22, 2008 14:33:52 GMT -7
Hi Myles- My gia just sounds so darn great without any pedals I never really been a pedal kinda guy anyways, even the morley a/b box colors it with and with out the battery, i use a feww guitars on stage any suggestions or thoughts on the pedal thing or how i can change guitars without looking to retarded ie how come that does use a/b do you know any other players who just like the gia alone?? Thanks Harris
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Post by myles on May 22, 2008 15:28:30 GMT -7
Hi Myles- My gia just sounds so darn great without any pedals I never really been a pedal kinda guy anyways, even the morley a/b box colors it with and with out the battery, i use a feww guitars on stage any suggestions or thoughts on the pedal thing or how i can change guitars without looking to retarded ie how come that does use a/b do you know any other players who just like the gia alone?? Thanks Harris Buddy Whittington ... John Mayall's Blues Brothers for the last dozen or so years and he has his own band as well .... uses a Carmen Ghia A LOT. The only pedal he uses is a tuner pedal A lot of tuner pedals have a mute function .... hence, great to use to change guitars.
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harris
Junior Member
Posts: 65
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Post by harris on May 28, 2008 19:19:12 GMT -7
Thanks for that info- One question for ya- will el84s @ a 4 rating hurt the gia? thanks Myles
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Post by myles on May 29, 2008 8:05:55 GMT -7
Thanks for that info- One question for ya- will el84s @ a 4 rating hurt the gia? thanks Myles They will work fine and dandy and run a bit cooler as well.
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Deleted
Deleted Member
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Post by Deleted on May 29, 2008 14:19:37 GMT -7
Hey Myles,
I have a Route 66 and would like it to give up the goods a little sooner. Right now I have just re tubed with a Svetlana EF86, balanced Sovtek 12AX7LPS, and Gold Lion KT66's. The KT66's are biased as low as the bias pot would permit, 27mA. Is there anything else I could do?
Thanks, Doug
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Post by myles on May 29, 2008 15:46:23 GMT -7
Hey Myles, I have a Route 66 and would like it to give up the goods a little sooner. Right now I have just re tubed with a Svetlana EF86, balanced Sovtek 12AX7LPS, and Gold Lion KT66's. The KT66's are biased as low as the bias pot would permit, 27mA. Is there anything else I could do? Thanks, Doug Biasing low will do little more than make the amp sound grainy and it will not develop full power. What you need is a set of tubes that give up the goods faster. In GT lingo that would mean going from a middle rating of 5-6 to a lower rating of 2-3. If you can find out what the current output was on your tube set at what B+ voltage and what bias voltage in milliamps for the plate current and on what tester this was done I can then work with your particular vendor and give them a number that would help you move in your desired direction.
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Deleted
Deleted Member
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Post by Deleted on May 29, 2008 19:21:45 GMT -7
Biasing low will do little more than make the amp sound grainy and it will not develop full power. What you need is a set of tubes that give up the goods faster. In GT lingo that would mean going from a middle rating of 5-6 to a lower rating of 2-3. If you can find out what the current output was on your tube set at what B+ voltage and what bias voltage in milliamps for the plate current and on what tester this was done I can then work with your particular vendor and give them a number that would help you move in your desired direction. The vendor was Tube Depot. The other info I just don't have. Thanks for your quick response. You are always a big help Doug
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Post by myles on May 30, 2008 8:41:09 GMT -7
Biasing low will do little more than make the amp sound grainy and it will not develop full power. What you need is a set of tubes that give up the goods faster. In GT lingo that would mean going from a middle rating of 5-6 to a lower rating of 2-3. If you can find out what the current output was on your tube set at what B+ voltage and what bias voltage in milliamps for the plate current and on what tester this was done I can then work with your particular vendor and give them a number that would help you move in your desired direction. The vendor was Tube Depot. The other info I just don't have. Thanks for your quick response. You are always a big help Doug Doug ... Give them a call and ask if they use a Maxi-Matcher. I think they might. If they do, let me know what setting they used on the tubes and the number that was on the boxes you have. I can then come up with a number for them to look for when they test if you go to them in the future.
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Deleted
Deleted Member
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Post by Deleted on May 30, 2008 18:34:21 GMT -7
The vendor was Tube Depot. The other info I just don't have. Thanks for your quick response. You are always a big help Doug Doug ... Give them a call and ask if they use a Maxi-Matcher. I think they might. If they do, let me know what setting they used on the tubes and the number that was on the boxes you have. I can then come up with a number for them to look for when they test if you go to them in the future. I'll do that and get back to ya. Thanks
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Post by myles on May 30, 2008 19:34:28 GMT -7
Doug ... Give them a call and ask if they use a Maxi-Matcher. I think they might. If they do, let me know what setting they used on the tubes and the number that was on the boxes you have. I can then come up with a number for them to look for when they test if you go to them in the future. I'll do that and get back to ya. Thanks Okie - doakie
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Post by real oldster on May 31, 2008 13:10:50 GMT -7
Man, don't ya love a straight answer?
I must have had to go to the bathroom or something as my reply was to the point and did not digress all over the place. Yes Oldster, you put it in a very nice way that my answer was uncharacteristic of me I don't remember posting that but I think it was a straight-up appreciation. No sarcasm intended. This time.
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Post by Buzz Fretwear (Ignatius) on Jun 2, 2008 16:37:28 GMT -7
Myles,
I'm not sure if it's my imagination or not, but does this make sense?
I recently acquired a Maz Jr, my fourth Z. I'm using a 5751 in v1 and running the Master wide open to give me the most headroom, but in the ten or so gigs I've done since getting it, I've noticed that as the gig progresses into the wee hours the amp tends to break up more. I've even noticed this phenomenon in the past with my Maz Sr. Well anyway, at one of this past weekend's gigs I put the amp on standby in between sets, and it seemed to remain cleaner through the entire gig.
Am I nuts? Is this just my imagination, or does using the standby keep things running cooler somehow?
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Post by myles on Jun 3, 2008 10:56:59 GMT -7
Myles, I'm not sure if it's my imagination or not, but does this make sense? I recently acquired a Maz Jr, my fourth Z. I'm using a 5751 in v1 and running the Master wide open to give me the most headroom, but in the ten or so gigs I've done since getting it, I've noticed that as the gig progresses into the wee hours the amp tends to break up more. I've even noticed this phenomenon in the past with my Maz Sr. Well anyway, at one of this past weekend's gigs I put the amp on standby in between sets, and it seemed to remain cleaner through the entire gig. Am I nuts? Is this just my imagination, or does using the standby keep things running cooler somehow? After the amp has been running for 15 or so minutes things should be pretty stable. How many hours do you generally have on your output tubes between changes?
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Post by JASON (aka jgleaton) on Jun 3, 2008 13:17:12 GMT -7
Hi Myles... This is a question from Shannon ( aka Shan-batical right now)... His question's are: 1st. Which KT 88's should he go with in his Delta... C2s or SVs?? and I guess what the difference is between them... 2nd. Kinda depends on the first but, what do you use in your Delta and basically what would you recommend he use and where to set the bias at?? I'd prolly be helping him bias it up so thats more fer me... Thanks so much Myles... Jason PS... as he's on his Great grand pause right now he asked me to ask you for him... Personally I think thats Cheating, but he has a PANK guitar so what do you expect... I mean really.
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Post by myles on Jun 3, 2008 15:49:07 GMT -7
Hi Myles... This is a question from Shannon ( aka Shan-batical right now)... His question's are: 1st. Which KT 88's should he go with in his Delta... C2s or SVs?? and I guess what the difference is between them... 2nd. Kinda depends on the first but, what do you use in your Delta and basically what would you recommend he use and where to set the bias at?? I'd prolly be helping him bias it up so thats more fer me... Thanks so much Myles... Jason PS... as he's on his Great grand pause right now he asked me to ask you for him... Personally I think thats Cheating, but he has a PANK guitar so what do you expect... I mean really. The SV not the C or C2. The C's have things like getters fall off in travel and do not have the output of the SV or the tone. Bias at at least 45mA .... on my amp and those of people like Michael Burks and Brad's Delta I have things set at 50mA and that is still only 50% ID so the tube life will be years and the temperature will be quite low.
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Post by JASON (aka jgleaton) on Jun 3, 2008 22:38:21 GMT -7
The SV not the C or C2. The C's have things like getters fall off in travel and do not have the output of the SV or the tone. Bias at at least 45mA .... on my amp and those of people like Michael Burks and Brad's Delta I have things set at 50mA and that is still only 50% ID so the tube life will be years and the temperature will be quite low. Thats just what we needed to hear! He's gotta get some tubes and I gotta help him bias it up... think we'll go ahead and bias it around 50 mA too. Thanks Myles!! Jason
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Post by myles on Jun 4, 2008 9:49:23 GMT -7
The SV not the C or C2. The C's have things like getters fall off in travel and do not have the output of the SV or the tone. Bias at at least 45mA .... on my amp and those of people like Michael Burks and Brad's Delta I have things set at 50mA and that is still only 50% ID so the tube life will be years and the temperature will be quite low. Thats just what we needed to hear! He's gotta get some tubes and I gotta help him bias it up... think we'll go ahead and bias it around 50 mA too. Thanks Myles!! Jason You are more than welcome.
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Deleted
Deleted Member
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Post by Deleted on Jun 4, 2008 13:44:46 GMT -7
I'll do that and get back to ya. Thanks Okie - doakie Hey Myles, Sorry it took so long to get back to you. This is my original question. Hey Myles,
I have a Route 66 and would like it to give up the goods a little sooner. Right now I have just re tubed with a Svetlana EF86, balanced Sovtek 12AX7LPS, and Gold Lion KT66's. The KT66's are biased as low as the bias pot would permit, 27mA. Is there anything else I could do?I called Tube Depot and they do use the Maxi-Matcher with a plate voltage of 400V, a -48 bias and the idle current in mA on the plates are 36. Also The plate voltage in my Route 66 is 451VDC. I have biased the amp to 50% of tube dissipation. Actually one tube is at 28mA and the other is at 32mA. Thanks, Doug
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Post by myles on Jun 5, 2008 8:44:52 GMT -7
Hey Myles, Sorry it took so long to get back to you. This is my original question. Hey Myles,
I have a Route 66 and would like it to give up the goods a little sooner. Right now I have just re tubed with a Svetlana EF86, balanced Sovtek 12AX7LPS, and Gold Lion KT66's. The KT66's are biased as low as the bias pot would permit, 27mA. Is there anything else I could do?I called Tube Depot and they do use the Maxi-Matcher with a plate voltage of 400V, a -48 bias and the idle current in mA on the plates are 36. Also The plate voltage in my Route 66 is 451VDC. I have biased the amp to 50% of tube dissipation. Actually one tube is at 28mA and the other is at 32mA. Thanks, Doug A 4mA spread is a good match. 10% is a good match and 20% spread is still an industrial match. 451 V 30 W 40% 50% 60% 70% 27 33 40 47 Run the bias up to 40mA if you have 450-460 B+ on the higher tube and that should work great with the 4mA spread.
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Deleted
Deleted Member
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Post by Deleted on Jun 5, 2008 12:35:27 GMT -7
Myles,
I was figuring the Gold Lions were a 25 watt tube I see they are actually a 30 watt tube. Thanks for the correction.
Thanks for the help Myles. I know you are a busy man.
Doug
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