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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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I have a friend who has a pair of VTL 80 monoblock amps. I take it to mean they are rated at 80 watts per channel. This is accomplished with a 12at7 voltage amp--->12at7 long tailed pair to a quad of PPP 6L6's. Bias point is 28ma per tube. It is claimed the amp runs AB1 tetrode mode but may be operated in triode mode at the same bias point with no changes and if done so will operate in class A.Does anyone else feel this is impossible...at least without exceeding the tube's rating?
Looking at a current production amp, the tiny triode, they claim 40 watts out of a quad of EL84's in PPP and if triode strapped that same quad of EL84's in PPP will deliver 25 watts. That might not quite as far fetched as the 6L6 amp above but it also seems unlikely to me.
So what do you guys think? False advertising? Operating points well above the tubes rating? That I am crazy and don't know how to read tube specs?
Russ
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Topic - I think I smell a rat and would like your thoughts gentlemen - Russ57 07:14:18 06/16/05 (33)
- I think you are wrong - richardl 10:59:41 06/16/05 (16)
- 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)
- Just to be clear... - Russ57 10:38:52 06/16/05 (6)
- Re: Just to be clear... - Triode_Kingdom 10:54:58 06/16/05 (5)
- Can you buy the triode rating too? - Russ57 11:22:28 06/16/05 (4)
- Re: Can you buy the triode rating too? - Triode_Kingdom 13:27:02 06/16/05 (0)
- Re: Can you buy the triode rating too? - Pär 13:12:47 06/16/05 (2)
- I think the preceding post was about EL84s?(nt) - JJ Triode 13:16:07 06/16/05 (1)
- Re: I think the preceding post was about EL84s?(nt) - Pär 13:57:20 06/16/05 (0)
- 'may be operated in triode mode at the same bias point' - JJ Triode 09:45:36 06/16/05 (3)
- Re: 'may be operated in triode mode at the same bias point' - Henry Pasternack 12:05:21 06/16/05 (2)
- I looked at some specs for the 6L6... - JJ Triode 13:07:49 06/16/05 (1)
- the second paragraph... - Homer Jay 03:17:55 06/17/05 (0)
- VTL is not a fly-by-nite outfit (long text) - cheap-Jack 09:19:31 06/16/05 (1)
- Re: VTL is not a fly-by-nite outfit (long text) - louielouielouie 16:50:13 06/16/05 (0)
- Re: I think I smell a rat and would like your thoughts gentlemen - Jimmy 08:28:00 06/16/05 (0)
- I don't understand - Triode_Kingdom 08:16:45 06/16/05 (0)
- Re: I think I smell a rat and would like your thoughts gentlemen - Dehart 07:31:47 06/16/05 (0)
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