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Post by Paul (TRANE) on Aug 9, 2005 8:48:57 GMT -7
Myles,
I love the sound of the GT-E34LS and find it to be, to my ears, a great mix of KT-66 and EL34. The bass response is tighter than a standard EL34 and the midrange and treble complexities are greater than expected. Closer to a KT66 in my mind. Was this tube designed to be able to do more than just the EL34 British sound or am I just imagining it? Killer tube in the 6545 head!!
Love the Guitar Amplifier Blueprinting website too.
Paul
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Post by terryg on Aug 11, 2005 15:49:40 GMT -7
I've got the same tubes in my 6545 at a #6 rating (I understand Dr.Z stocks them this way). As I recall mine are biased at 28mA, but I totally forget. I killed my DMM somehow (user error, no doubt), just got another and I'll be checking tonight.
The GTE34LS is a 30W tube if I remember correctly, unlike "regular" EL-34 tubes which make 25W. When I biased last, I did it with the SS rectifier that Dr.Z ships, then plunked in a 5AR4 from Mike K. at KCA. On that topic, I'm running a GEC EF86, a pair of Brimar CV4004s (V1 & V2) from Mike K, and a 12AX7C MPI from Myles/GT. I have no complaints, nor did I before I went experimental.
IF I'M WRONG about anything please teach me, I'm always eager to learn!
Oh yeah, the GAB website has taken on a whole new meaning.
Cheers, Terry
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Post by myles on Aug 12, 2005 19:19:00 GMT -7
Terry.....
You are right on the money here.
If you hit my website on the first page near the top on the right there is a little button thingy that is not labelled.
If you press it you will get a modified Duncan Amps bias spreadsheet in excel. I have various tubes and settings listed. I made this for myself as then I can be just about anyplace there is a PC and have my "notes" etc.
So just plug in your plate voltage (measured off pin 3 of the output tube socket .... from the bottom of the chassis so you can have the tubes installed .... because if you pull one the lack of load will make the B+ go falsely up. Have a speaker connected. Nothing in the input .... amd volume down.
Once you plug in the B+ and the tube wattage (30 for the LS) you will see the milliamp numbers appear.
On the KT88SV by the way, I have this as a 42 or so watt tube if I remember correctly .... but these are easily 50 watt tubes. That is just something that popped into my head as I remember you playing the Delta 88 and we compared it to the KT-45.
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Post by myles on Aug 12, 2005 19:25:32 GMT -7
Myles, I love the sound of the GT-E34LS and find it to be, to my ears, a great mix of KT-66 and EL34. The bass response is tighter than a standard EL34 and the midrange and treble complexities are greater than expected. Closer to a KT66 in my mind. Was this tube designed to be able to do more than just the EL34 British sound or am I just imagining it? Killer tube in the 6545 head!! Love the Guitar Amplifier Blueprinting website too. Paul Paul .... Aspen Pittman was at one time in partnership with the Tesla factory. At that time he developed the LS with more plate mass than a regular EL-34. The intent was probably to have a stronger tube but you would have to ask Aspen what was going through his head at the time. Anyway ... Tesla went away and JJ sort of continued things. GT and JJ are still tied in closely. The LS is a 30 wqatt tube and some folks that swear by it are Joe Walsh, Joe Perry, Billy Gibbons. In a 100 watt Marshall I have seen 150 watts with ease. 50 watt Marshalls with good power supplies get 70+ watts easily with an LS. The plate strucure is more massive. Look at a JJ E34L next to a GT E34LS. Where the plates join on the GT tooled tube there are heat sink wings that are not on the L. Same deal with the KT-88SV .... a JJ produced / GT tooling design. Four big heat sink wings on that puppy. The E34LS has more lows, lower mids and mids than a typical EL34 of the same static specs. Some folks love this because it is "thicker" than an EL34 but not as mid heavy as a 6L6. I guess to some ears it is a cool bit of both.
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