In Reply to: I think you are wrong posted by richardl on June 16, 2005 at 10:59:41:
The example you mention has the plate at 450 and the screen at 400. IIRC a standard 6L6 is rated for a maximum plate voltage of 350 and a maximum screen voltage of 250. So this is a prime example of what I think VTL did. Namely operate a tube beyond it's published maximum rating.But hey, I am ready to be proven wrong. Actually I'd like to be wrong as this is a friends amp who is having some run away tube problems from time to time.
Russ
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Yes but look at the plate and screen voltage compared to maximum ratings - Russ57 11:13:45 06/16/05 (15)
- Indeed you are (wrong) - Zung 11:47:51 06/16/05 (0)
- tube data - nicolas 11:46:17 06/16/05 (13)
- Then I stand corrected...thanks gentlemen...I will make sure he uses the 6L6GC(nt) - Russ57 11:59:48 06/16/05 (12)
- 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)