In Reply to: Then I stand corrected...thanks gentlemen...I will make sure he uses the 6L6GC(nt) posted by Russ57 on June 16, 2005 at 11:59:48:
VTL amps are often designed running the output tubes WAY over their screen and anode voltage ratings!I even confronted Luke Manley about this once at a hifi show, and he admitted it but said the tubes they supply are built to special standards and you HAVE to use their tubes in their amps.
To this I say B***S***!
If they have a special tube built, then it should have a special number and not cause techs all over problems when they re-tube a VTL using what would appear to be perfectly acceptable tubes.
I've gone as far as changing VTL's to cathode bias to try and maintain some reliability - it worked but lost some power.
Allen
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Follow Ups
- In my experience of servicing VTLs across 20 years or so, - Allen Wright 04:09:08 06/17/05 (11)
- any tech worth his salt would measure all voltages first...as matter of course - elblanco 18:31:56 06/17/05 (0)
- Doesn't qualify as engineering - Triode_Kingdom 13:07:40 06/17/05 (2)
- Again, this is a commercial real world. - cheap-Jack 11:04:46 06/20/05 (0)
- Agree! (nt) - Allen Wright 15:02:25 06/17/05 (0)
- Thank you Allen - Russ57 05:46:08 06/17/05 (6)
- With only Lowthers to drive... - Allen Wright 15:09:58 06/17/05 (0)
- This is a comercial real world. - cheap-Jack 09:03:27 06/17/05 (3)
- The 12bh7 swap IS "specified in the service manual" as is triode operation(nt) - Russ57 14:17:12 06/17/05 (0)
- Not exactly - Triode_Kingdom 13:14:51 06/17/05 (1)
- Right, "not exactly". - cheap-Jack 13:22:33 06/20/05 (0)
- Re: Thank you Allen - Tom Bavis 06:23:39 06/17/05 (0)