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6HV5A Single Ended Amp
6HV5A Single Ended Amp
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Old 16th June 2010, 03:29 AM   #71
Tubelab_com is online now Tubelab_com  United States
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Or is it just that cliplead parasitics are driving you nuts?
I have been told over and over that you can't build an amp using clip leads. I have never been one to listen very well so I did it......about a zillion times. Yes there are some tubes that you CAN'T clip lead together the 5842 / 417A is one and the 6EJ7 is another. It appears that the 6HV5 and friends are also on this list. Note that tubes with lots of transconductance seem to be clip lead unfriendly.

Note the method of construction used in these fully functional amps.

As for 6HV5, might see if its any more stable when Schaded to lower Mu? Particularly DC coupled 100% PG without voltage gain. That could be an
interesting mode of operation in A2, if you could toss some direct coupled
sand between Schade and Grid without a phase shift back to instability???
That is where I may go next. Reduce the gain AND the output impedance via local feedback to make a $1 triode sound like a $50 triode.

Waitaminute... I got 13pin sockets.
Then you really have something weird, since they should be 12 pin sockets. Others have suggested sky wiring octal or 9 pin sockets into this board, but that is too much work. There are dozens of 12 pin tubes that work in this board, many of them cheap. 6GV5's were on the dollar menu until this board came along.

Tube testers may tell you what the Gm is under rather low powered conditions. They don't tell you much about waht happens at 30 watts though.
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File Type: jpg 6CD6GAtest.jpg (107.3 KB, 461 views)
File Type: jpg DontTryThisAtHome_A.jpg (265.2 KB, 435 views)
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Old 16th June 2010, 03:45 AM   #72
wrenchone is offline wrenchone  United States
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I agree that a 6HV5 or one of its siblings might be a natural for a partial feedback (Schade-style) amp as a way of utilizing all that excess gain. I was thinking of a modest triode-pentode pair (people can insert their faves) for the front end, with the pentode as voltage amp and the triode as cathode follower to direct drive the grid. I would look for a tube that had a medium-mu, relatively high gm triode (get out your tube manuals). The amp might end up with enough feedback, even with a Schade-style setup, to sound solid state-ish...
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Old 19th June 2013, 03:01 PM   #73
Vinylsavor is offline Vinylsavor  Germany
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Ever wondered how such a beam triode looks inside?

Check out my post about this tube with photos of the grid:

VinylSavor: Tube of the Month : The 6HV5A

Best regards

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Old 20th June 2013, 03:02 AM   #74
radiotron is offline radiotron  New Zealand
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Thanks Thomas, very interesting!
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Old 20th June 2013, 04:06 AM   #75
multi is offline multi  Australia
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Default 811A SE

Nobu Shishido's SE using the 811A
430 volts supply for 13.5 watts. 3.5K transformer
I made a 811A SE but used a 6BX7 as a cathode follower to drive it.
Fewer transformers the better.!!!
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Old 20th June 2013, 05:55 AM   #76
wrenchone is offline wrenchone  United States
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The 6HV5A must have been one of the largest frame grid triodes ever made. I wonder what the reject rate was on those tubes - maybe they had a special jig for grid-to-cathode spacing.
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