Single-Ended Pentode Redux
- Paul Barker
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#76 Re: Single-Ended Pentode Redux
cool!
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- Cressy Snr
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#77 Re: Single-Ended Pentode Redux
Been fecking with the power supply this afternoon and have split the channels after the CLC filter.
Now it’s 50u/4H/50u then splitting into one 220R/100u RC filter per channel.
Can’t listen properly yet: not until after “The Masked Singer” finishes
Now it’s 50u/4H/50u then splitting into one 220R/100u RC filter per channel.
Can’t listen properly yet: not until after “The Masked Singer” finishes
Sgt. Baker started talkin’ with a Bullhorn in his hand.
#78 Re: Single-Ended Pentode Redux
Good god you do watch some shite
- Cressy Snr
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#79 Re: Single-Ended Pentode Redux
It’s not me, It’s your mam.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#80 Re: Single-Ended Pentode Redux
lol
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
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#81 Re: Single-Ended Pentode Redux
Been doing a bit of planning for the next iteration of the E-Linear amplifier. Driver stage will be a D3a in pentode mode:
This will be the one that will go in the box if it works as well as I think it will.Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#82 Re: Single-Ended Pentode Redux
Tried this PSU on the existing 6V6 iteration:
It's nice.Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#83 Re: Single-Ended Pentode Redux
Again, I can ‘sense’ the silence, but this time there is no sonic penalty.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
#84 Re: Single-Ended Pentode Redux
Thats close to the layout on my mofo drivers Steve, but like to run closer to choke input, and then adjust the 1st cap to get the voltage where I want it, usually .5 to 4 uf, but again that is very transformer dependant (what I have vs the voltages I want)Cressy Snr wrote: ↑Tue Jan 25, 2022 8:00 pm Tried this PSU on the existing 6V6 iteration:
Elinsplitchokespsu.png
It's nice.
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number
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#85 Re: Single-Ended Pentode Redux
It always goes like that.steve s wrote: ↑Wed Jan 26, 2022 9:00 amThats close to the layout on my mofo drivers Steve, but like to run closer to choke input, and then adjust the 1st cap to get the voltage where I want it, usually .5 to 4 uf, but again that is very transformer dependant (what I have vs the voltages I want)Cressy Snr wrote: ↑Tue Jan 25, 2022 8:00 pm Tried this PSU on the existing 6V6 iteration:
Elinsplitchokespsu.png
It's nice.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
#86 Re: Single-Ended Pentode Redux
True I've been lucky enough to buy all the decent looking transformers I can from radio rally's this last 20 odd years, all have been great.. but I ways listen for crackles in the dark now.
The other things I always do is measure the resistances of both windings, usually about 1or 2 ohm difference I then add resistance to match them up. I also make sure the rectifier is matched both sides, and add a small cap across the 1st choke.
All things I read about in 1930s books
Wouldn't like to say they make a difference.
The skill is linking what you hear and recognition of whats doing what.
Dynamics and bass response are the thing to focus on. But there's loads of other parts of the amp, (or should I say all) affect these too
I would guess dynamics are hard to measure but I trust my ears, rightly or wrongly
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number
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#87 Re: Single-Ended Pentode Redux
I've done this now with the PSU for the E-Linear amp: It's putting out the voltages bang where I want them - 5R4GY being used to cater for 6V6 and GZ34 to cater for EL34.
6V6 is running at about 80% of plate dissipation.
EL34 runs at around 50%.
Both valves sound great.
Edit the quote from Steve was fooked up.
Last edited by Cressy Snr on Wed Jan 26, 2022 7:21 pm, edited 1 time in total.
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- Cressy Snr
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#88 Re: Single-Ended Pentode Redux
PSUD sim:
Sgt. Baker started talkin’ with a Bullhorn in his hand.
#89 Re: Single-Ended Pentode Redux
The problem now is the Dcr of the second choke. But then you end up with boatankers.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- Cressy Snr
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#90 Re: Single-Ended Pentode Redux
Aye, that was in my mind all the time, but they’re all I have. TBH I’m now at the limit as to what I can achieve passively with the parts I have. It’s obviously crying out for a regulator as the next point in its evolution.
Sgt. Baker started talkin’ with a Bullhorn in his hand.