Thanks Walter, 🙂
(40W) 25% is 10W seems I will get 8W in Triode.
So this may be suffice to me, from a low priced tube its not bad.
While you were deciding I already sold 2 prototypes of my Edelweiss amp on ePay. However, only 4 and 5 W per channel, but still good for high efficiency speakers.
Here's the project in breadboard form: CatSkin Class A2 SET with Secondary Flux Cancellation
The 10W figure is for limiting just visible on the scope, so probably near 3~5% THD. There is no notch in the distortion residual waveform as grid current begins to flow. This was achieved with a semiconductor grid drive buffer.
TV sweep tubes in audio service can be safely pushed pretty far past their dissipation specs -- perhaps as much as 40%, according to some sources (John Stewart).
It just it? This video is a collage of images, there is no camera moving into the room and the sound is direct from the CD player.
Any link to Ebay?
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No, the sound IS NOT direct from the CD player. Don't you hear speakers & room acoustic? However, what the amp adds to it, is so negligible, so you can't hear any coloration...
The amp is on top of the rack, and he shows it in a separate picture, time to time.
Here is my record, this time with my speakers that are worse than his...
https://www.youtube.com/watch?v=y7oxwdSgUs8&t=9s
Speaking of eBay, it is too late, as I already explained. You are deciding too long. 🙂
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Here is one more record, with the same relatively cheap JBL-990 monitors, but a different pentode amp. Not just pentode; 2 pentodes with nested feedback, but different kind of pentodes. No, I am not selling it yet. It is a prototype that I use now to show to potential partners and customers.
https://www.youtube.com/watch?v=526Q-xiqpkU&t=18s
https://www.youtube.com/watch?v=526Q-xiqpkU&t=18s
I fail to hear the room acoustics, my PC speakers are small.
I see that amp on top the rack, what are the tubes?
Any photo under side?
I see that amp on top the rack, what are the tubes?
Any photo under side?
The GK71 amp sounds great congratulations.
The 4П10C tube is so rare GSTubes dont have any.
Do you sell that tube?
Any datasheet in English?
The 4П10C tube is so rare GSTubes dont have any.
Do you sell that tube?
Any datasheet in English?
Not anymore. Stay tuned; may be while you are deciding what to put inside of your amp I will have some more prototype for sale. ;-)
I also sold one triode push-pull amp prototype, 10 W per channel, also with nested loops, 2 of them were positive feedback loops by current.
As usual, the sound is recorder in the room on my iPhone, it is not a CD track 🙂
https://www.youtube.com/watch?v=qsb2Hzq7sD8
https://www.youtube.com/watch?v=iZ4BDSrHkxI
Thank you! Yes, GK-71 are great tubes.
https://www.facebook.com/Wavebourn/videos/1541634742561488/
4П10С are sometimes on ePay. And yes, I can sell them. I bough some from a British lady.
No datasheets are available, in any languages, just test conditions for military users. They forgot to de-classify them, like US and British military sweep tubes VT-127 and CV-1127. But you can use datasheets for Pen-46 tube that was used as a prorotype for them.
By the way, here is one more version of the same Edelweiss design, this time with US made tubes 6СD6.
https://www.facebook.com/Wavebourn/videos/1372489192809378/
https://www.facebook.com/Wavebourn/videos/1372489192809378/
I should study then, how designs like my Bugera V22, with a triode/pentode switch, deal with this.
Again, referencing my Bugera V22, although a Chinese made amp, it is a standard design, built well and sounds great! DIY doesn't mean a better amp in many cases, especially in experimental, untested designs.
Most likely its a copy of someone else's design. But pentode to triode switching is not that hard to come up with either.
May I make a suggestion to you, why not use currently manufactured tubes. There is nothing wrong with them, and there is nothing to gain using non standard tubes.
Btw how did your project with your coffee maker go?
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