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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 21 Feb 2018, 04:33

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PostPosted: 01 Mar 2017, 06:09 
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Joined: 08 Aug 2009, 03:11
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Location: Chilliwack, BC
tizman wrote:
I played around with the pentode curves to see what a 5K load OPT looks like and it doesn't look great.


When paralelling, you use the curves for one tube at load (8K in this case), then reciprocal for the amount of tubes. So, a single SEP = 1/1 = 8K. Parallel class-A tubes (pentode, triode, whatever-ode) = 1/2 = 4K. Three tubes = 1/3 = 2.66K, etc.

tizman wrote:
Would a anyone happen to have triode curves for this tube?


Trioding these will give you pretty much the power of parallel section ECC88. Then do Bruce's headphone amp for better results ;)

Cheers!

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PostPosted: 01 Mar 2017, 13:13 
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Joined: 20 Apr 2015, 01:30
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Thanks Gregg. Parallel pentodes it is! I'm glad that this finally motivated me to do some pentode load lines. Here are a few pictures of the tubes. This is about two thirds of them, there is another container of loose ones somewhere and a dozen or so in boxes. I don't think I have as many as I thought though. More close to 90 in total. Mixed in with the 12BY7A bag was 30 12GN7a that I separated. Are these useful?


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PostPosted: 01 Mar 2017, 14:21 
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That would make a Citation owner drool :D

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-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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PostPosted: 01 Mar 2017, 17:30 
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I'm always drooling over things I don't have. The last photo is a bunch of 12GN7As. Are they good for anything? Since I have a bunch :thumbsup:


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PostPosted: 02 Mar 2017, 00:01 
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36,000uMhos? Holy crap! That'd be a great spud amp :D
Look at those transfer curves. Dang! I'd say yes.


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-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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