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Old 3rd January 2012, 09:20 PM   #301
Cassiel is offline Cassiel  Libya
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The 6V6 is a great tube, 6L6's don't play in the same category. EL34 might also be good but too much filament current and big size makes it a non ideal candidate. I seem to remember a 6AS7 doing preamp duty, now that is weird.
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Old 3rd January 2012, 09:56 PM   #302
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People use 6c33c for preamps.

Keeps the cold away in winter .
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Old 3rd January 2012, 09:58 PM   #303
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6c33c in srpp as well
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Old 3rd January 2012, 09:59 PM   #304
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What do you think about 307 dht tetrode?
Low cost,lesss power than 300b and very linear?
CIao
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Old 3rd January 2012, 10:11 PM   #305
tinitus is offline tinitus  Europe
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time for alternative thread

give it a title, and we move these post over

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Old 3rd January 2012, 10:38 PM   #306
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Thank you! Nothing personal, but that is how threads get so long that no one wants to read them. I already feel bad for the clutter I have caused. Feel free to delete non important discussion, mine included, as this is a specific build thread that is relatively short at the moment.

Last edited by buzzforb; 3rd January 2012 at 10:41 PM.
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Old 3rd January 2012, 11:49 PM   #307
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by SGregory View Post
Kevin,
Care to expand your comment reguarding recent experience. Was your recent experience pro or con regulator?

My experience with regulators has been nothing but positive till I do something stupid with them.
I recently ran into a situation with my transformer coupled 26 line stage where the "improvements" in a particular regulator design which measured spectacularly well also made quite a footprint on the sonics - which in this case resulted in a spectacular compromise in sound quality. It may be the case that once the source impedance is down to a few tens of ohms you start to hear the regulator and not the capacitor across its output terminals. (A good compromise seems to be when the regulator dominates the source impedance up to a few hundred Hz and then the cap(s) take over.) I don't think this is an issue with RC coupled circuitry at all, but it is quite interesting with transformer coupled designs. The supply in question is a series pass with 6V6 series pass in pentode connection with a cascode 6DJ8 error amp with a zener reference.. I've had some luck with CCS based designs and am going to revisit the shunt thing soon.
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Old 4th January 2012, 01:30 AM   #308
Cassiel is offline Cassiel  Libya
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Quote:
Thank you! Nothing personal, but that is how threads get so long that no one wants to read them.
I see no problem, we're not talking about cars. Interesting comments by Kevin about regulators.
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Old 4th January 2012, 04:04 AM   #309
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Quote:
Originally Posted by Salas View Post
It could, but the dissipation should be much higher than 6V6 class which is already nicely linear in triode. Fat older ST bottle (Coca Cola style) 6V6 tend to sound mellower and be more ringy in this application. In power amps the output transformer ratio extinguishes the voltage gain into current transformation so microphonic behavior its not noticeable.
Did you try this one?

Click the image to open in full size.
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Old 4th January 2012, 04:19 AM   #310
Salas is offline Salas  Greece
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What type does this curve tracer screen refers to?
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