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In Reply to: RE: Things are quiet here. posted by jusbe on May 27, 2014 at 00:43:24
I came to the end of the road with amps after about 30 years building. I found I liked the sound of the 4P1L more than all the other tubes I was using (26, 300b etc), found I could make a PSE amp with two stages of 4P1L, built it all in filament bias with Lundahl interstage and OPTs and that's it. Best amp I ever built.
Can't think of how to improve it so I just listen to it. I bought 150 of the 4P1L so got that covered. Drive it with a Mac Mini through a battery powered ES9023 DAC into Mark Audio Alpair 10s and there's nothing much I want to change. DACs will get better and I'll upgrade at some point, but I hardly have much to post about any more.
Don't know who else just ended up satisfied with what they have.
Follow Ups:
Hi Andy,
Is it the Russian 6П1Л?
Regards,
Tony
I have been put of SETs using DHTs like the 300B due to the current price gouging trend. That said, I have noted a growing contingent of builders using pentodes in place of 'ultra-priced' DHTs, and this may be more sustainable for a wider array of hobbyists and listeners.
Certainly seems more affordable...
big j.
"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
You can get Chinese 300B's for about $45 each. That isn't all that unaffordable.
The "stock" Shuguang is a fine tube. For an extra $200+ you get the same tube with a different (black) bottle and gold pins that doesn't sound very much different.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
4P1L is as cheap as it gets. That's one attraction. A couple are the equivalent of slightly more than a 2a3.
The alternative is high voltage transmitting tubes at low voltage. Low voltage 813 is a good equivalent to a 300b and a lot cheaper. More like it.
All used in triode.
As I understand it ( & please correct me otherwise) most who use the 4P1L in their preamp use a digital source (approx 2V) but if using a phono source instead, things are not so great with the 4P1L and microphonics becomes a real problem. Is there a DHT-Pre capeable of say 12-15db gain better suited for a phono source instead? Like I said before please correct me if my statements are incorrect. Are DHT preamps better suited for digital sources ?
Cheers
FM
I use a 26 linestage with a Gary Pimm 6ER5/6GK5 phono and love it.
...have no issues of gain in my system. Please check my profile to see what tables, carts, and tonearm I have. My speakers are ~ 98-100 db though.
I see you have a 4Pi. My brother has one and I do not think you will have a problem with the type 26 unless your amp's input sensitivity to full output is so low.
Abe
The 4P1L gets microphonic at low signals - you have to take extra measures. I don't use vinyl so I'm not bothered. You can use the 26 in filament bias - that's pretty well behaved, but only mu of 9
There's an ingenious phono stage using the 3a5. Have a look. Very good apparently.
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