these three have different characteristics, and most notably different voltage drop which will affect the operating point of the circuit it is powering.
me thinks what you heard is the change in operating point.
Hi,
The regulation would have changed according to the input voltage though.
May be a factor, may be not.
What type of regulator were you using?
Cheers, 😉
The regulation would have changed according to the input voltage though.
May be a factor, may be not.
What type of regulator were you using?
Cheers, 😉
Geek said:
This could be optimized further. Use 85A2/0G3 instead of the Zener for reference voltage 😉
Tom
Hi Tom,
Oh, indeed!
I have further refined this regulator, performance is now tenfold. I just haven't documented it yet (CVD tossing me behind on playtime
)
Oh, indeed!
I have further refined this regulator, performance is now tenfold. I just haven't documented it yet (CVD tossing me behind on playtime
)Geek said:Hi Tom,
Oh, indeed!
I have further refined this regulator, performance is now tenfold. I just haven't documented it yet (CVD tossing me behind on playtime
Yyyeesss, looking foreward to that 🙂
I need 320V at B+ on my 12B4A linestage, could I get this regulator
run at that?
Cheers Jan Jensen
Sure! Just ditch the sweep pentode and use a 12BH7 with both sections in parallel. That's my screen/low power regulator version.
too low for me.😀 no wonder the difference in sound. i wouldn't go lower than 100volts in any case.
the 6cd6g has a 175volt max screen rating, so you ought to have a series resistor in there!
with a 12bh7 in there, you probably can get about 70mA out of two sections in parallel with an input output differential of 150volts, and you will be exceeding plate dissipation at 10.5 watts.
a 6080 tube will be better here imho.
a 6080 tube will be better here imho.
Tony said:
I measured the Ig2 and while I now don't recall what it was, the dissipation was about 1/15 its watt rating.
In the final version, there's a choke and cap inline, reducing the output ripple to <50mV 🙂
Tony said:
6080 for a screen/low power regulator?
Good idea!
A shunt regulator would be simpler, cheaper (lower parts count) and do the same job.
For that matter, why not string some VR tubes and just use that? 😕
A shunt regulator would be simpler, cheaper (lower parts count) and do the same job.
For that matter, why not string some VR tubes and just use that? 😕
Geek said:
not necessarilly simpler , cheaper? -who cares?!! and will do same job better- at least for my ears
choky said:
and more stable too, in the sense that it is not subject to stability issues like the series pass regulator.
hey Geek,
i said 6080 becuase you spec'ed your regualtor as 300v @120mA so i thought a 6080 is better in that case.
btw, i love your site! there's a treasure trove of knowledge there!
😀
- Status
- Not open for further replies.