clay
New Member
Posts: 11
|
Post by clay on Aug 10, 2006 12:23:57 GMT -7
Hello, I'm new to this forum and have a couple of questions about my SRZ-65 RC combo. The amp was made in '95. It has 2 Celestion G12H30s and killer red tolex. I'll try and get pics. I just retubed it with JJ E34Ls and JJ ECC83s. I biased it at 38 mA. I'm thinking this was too hot because at a gig last night there was NO headroom at all with the master full up. Any advice on bias / tube suggestions appreciated.
|
|
|
Post by RC on Aug 10, 2006 18:55:43 GMT -7
Clay, Welcome to the forum. I would post your questions on tubes and biasing your SRZ over in the "Ask the Experts" section to Myles. He's as good as it gets when it comes to answering questions on amps, sailing, flying and hot models. I've got a new SRZ on order and I'd also be interested to here what Myles has to say on biasing.
|
|
|
Post by Phil (aka Phil) on Aug 11, 2006 4:27:02 GMT -7
RC, I gave you some Karma for the "sailing, flying, and hot models" line. I laughed out loud on that one! With all those amps he owns he probably is also the man to go to for divorce lawyer advice!
PDW
Also waiting for SRZ
|
|
|
Post by Curt on Aug 11, 2006 8:25:40 GMT -7
RC, I gave you some Karma for the "sailing, flying, and hot models" line. I laughed out loud on that one! With all those amps he owns he probably is also the man to go to for divorce lawyer advice! PDW Also waiting for SRZ That was a great line, and I think your correct on the Attorney comment. Myles, like me, is on spouse #3
|
|
|
Post by DRZ on Aug 11, 2006 13:31:43 GMT -7
Hello, I'm new to this forum and have a couple of questions about my SRZ-65 RC combo. The amp was made in '95. It has 2 Celestion G12H30s and killer red tolex. I'll try and get pics. I just retubed it with JJ E34Ls and JJ ECC83s. I biased it at 38 mA. I'm thinking this was too hot because at a gig last night there was NO headroom at all with the master full up. Any advice on bias / tube suggestions appreciated. Clay back the bias down to 32mA per tube. Also remember that V3 is a 12AT7 if it's a reverb SRZ. DR.Z
|
|
clay
New Member
Posts: 11
|
Post by clay on Aug 11, 2006 20:50:53 GMT -7
Thanks a lot Doc, and this amp is amazing. I've been a vintage Fender guy, who always wished I could get Marshalls to work for me. Now I can have that tone, and at any volume.
|
|
dan
New Member
Posts: 8
|
Post by dan on Aug 12, 2006 14:40:14 GMT -7
Clay,
I'm new to this board as well and very interested in the SRZ-65. When you mention that you can achieve the tone you like at any volume, exactly how low can you go with the MV? I'm very curious and any info would be appreceiated.
|
|
clay
New Member
Posts: 11
|
Post by clay on Aug 12, 2006 18:09:28 GMT -7
Dan, The SRZ-65 can be a VERY loud amp IF you want it to, but the MV is the best I've ever used, and allows you full control. You set the preamp for the tone you want ..then the master for the volume you want. Its that easy. Put on the live side of Fandango and imagine being able to get that sound in a small club, at a reasonable volume.
|
|
|
Post by hipfan on Aug 13, 2006 11:13:38 GMT -7
Another issue might be the power supply at your gig location. Unless you're using a voltage regulator, your amp could have been seeing wildly divergent wall voltages at the gig vs. the place you biased the amp.
In other words, let's say you set the bias at 38mA per tube in your house or rehearsal space, and the wall voltage was 117V at that particular time of day. At the gig location, however, your wall voltage could have been 128V. That increased wall voltage wil lraise your plate voltage significantly, and your per tube bias could move up around 50mA (just guessing here on the exact reading; there might be a formula for this, but I'm no tech or EE). Obviously, this would be way hot, and your amp would sound very different than if it were receiving 117V with a per tube bias of 38mA, which were the conditions reflected in your house or rehearsal space.
Wall voltage seems to be one of those variables that few tube amp users take into account (I'm not saying that's you, by the way; you may already be observant of all of this), but that can dramatically affect your amp's tone and response. I use a Furman AR15 II regulator to help with this problem, and it does a good job of locking the voltage in a reasonably narrow range around 120V.
I would certainly listen to DRZ's advice on this, though. For an amp with the plate voltage of the SRZ65, you should use a cooler bias than 38mA. If you're cranking up the amp quite a bit (as it seems you rightfully are doing), then I find a cooler bias to produce better results with my big-bottle amps anyway. They seem to hold their sonic stuff together better than if underbiased.
|
|
|
Post by chilicat on Sept 1, 2006 14:07:05 GMT -7
Hey Clay, How long have you had your combo. Mine is an SRZ65 RC as well but it has green backs in it. I love the sound of this amp. It is a bit heavy to haul to gigs but it's worth it. What is your serial # mine is 2004 I believe. Also do you use it with another cab under it? I wanted to get that "thud" on the low end for our rock stuff. The open back is cool I just wanted alittle more push on the low end. Drop me a line about your combo. Later!-------------Chili Cat
|
|
|
Post by skydog958 on Sept 2, 2006 17:04:20 GMT -7
I love that Fandango tone!! It's one of my main inspirations for looking into an SRZ
|
|
clay
New Member
Posts: 11
|
Post by clay on Sept 8, 2006 13:26:23 GMT -7
mine is serial number 2020 ....and dropping the bias to 32 ma did the trick ....its got plenty of bass for my needs, though I have been curious what it would sound like thru a cabinet.
|
|