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PSU for valves

Started by Peter February 17, 2021
I thought I'd experiment with a few valve circuits (just for fun).  So 
I'll need an H.T. power supply and I'm looking at this:
https://www.timstar.co.uk/el120300-high-tension-ht-power-supply.html
It supplies up to 300V at 60mA.  My question is, is 60mA sufficient?
-- 
When, once, reference was made to a statesman almost universally
recognized as one of the villains of this century, in order to
induce him to a negative judgment, he replied: "My situation is
so different from his, that it is not for me to pass judgment".
Ernst Specker on Paul Bernays
On 18/02/2021 12:51 am, Peter wrote:
> I thought I'd experiment with a few valve circuits (just for fun).  So > I'll need an H.T. power supply and I'm looking at this: > https://www.timstar.co.uk/el120300-high-tension-ht-power-supply.html > It supplies up to 300V at 60mA.  My question is, is 60mA sufficient?
Probably Ok for pre-amp valves but not for power amps.
Peter wrote:
------------------
> I thought I'd experiment with a few valve circuits (just for fun). So > I'll need an H.T. power supply and I'm looking at this: > > https://www.timstar.co.uk/el120300-high-tension-ht-power-supply.html > It supplies up to 300V at 60mA. My question is, is 60mA sufficient? > -
** That is clearly a regulated lab supply for experiments in physics. Major overkill for playing about with tube circuits. Expensive too. ...... Phil
Phil Allison wrote:
> Peter wrote: > ------------------ >> I thought I'd experiment with a few valve circuits (just for fun). So >> I'll need an H.T. power supply and I'm looking at this: >> >> https://www.timstar.co.uk/el120300-high-tension-ht-power-supply.html >> It supplies up to 300V at 60mA. My question is, is 60mA sufficient? >> - > > ** That is clearly a regulated lab supply for experiments in physics. > Major overkill for playing about with tube circuits. > Expensive too.
Can you recommend an alternative?
> ...... Phil >
-- When, once, reference was made to a statesman almost universally recognized as one of the villains of this century, in order to induce him to a negative judgment, he replied: "My situation is so different from his, that it is not for me to pass judgment". Ernst Specker on Paul Bernays
 Peter wrote:
===========> > ** That is clearly a regulated lab supply for experiments in physics. 
> > Major overkill for playing about with tube circuits. > > Expensive too. > Can you recommend an alternative? >
** FSS build something - takes about one hour of time One transformer, one bridge rectifier and one or two electros. Get yourself a Variac too. You can run heaters on a 6V battery. If you cannot manage that, you have no place fiddling with tube circuits. ...... Phil
On 18/02/2021 9:23 am, Peter wrote:
> Phil Allison wrote: >> Peter wrote: >> ------------------ >>> I thought I'd experiment with a few valve circuits (just for fun). So >>> I'll need an H.T. power supply and I'm looking at this: >>> >>> https://www.timstar.co.uk/el120300-high-tension-ht-power-supply.html >>> It supplies up to 300V at 60mA. My question is, is 60mA sufficient? >>> - >> >> ** That is clearly a regulated lab supply for experiments in physics. >>      Major overkill for playing about with tube circuits. >>      Expensive too. > > Can you recommend an alternative? > >> ......   Phil >> > >
Hey Pete, Read this one <http://education.lenardaudio.com/en/14_valve_amps_6.html>
RheillyPhoull wrote:

===========>
>> Read this one <http://education.lenardaudio.com/en/14_valve_amps_6.html>
** Then forget it. Even worse overkill than the lab supply. .... Phil
On 19/02/2021 8:12 am, Phil Allison wrote:
> RheillyPhoull wrote: > > ===========>> >>> Read this one <http://education.lenardaudio.com/en/14_valve_amps_6.html> > > ** Then forget it. > > Even worse overkill than the lab supply. > > > .... Phil >
You're such a bugger when you criticize Phil :-)
 RheillyPhoull wrote:
====================
>> > >>> Read this one <http://education.lenardaudio.com/en/14_valve_amps_6.html> > > > > ** Then forget it. > > > > Even worse overkill than the lab supply. > >
> > > You're such a bugger when you criticize Phil :-)
** ...... ;-0 ..... Phil
RheillyPhoull wrote:
> On 18/02/2021 9:23 am, Peter wrote: >> Phil Allison wrote: >>> Peter wrote: >>> ------------------ >>>> I thought I'd experiment with a few valve circuits (just for fun). So >>>> I'll need an H.T. power supply and I'm looking at this: >>>> >>>> https://www.timstar.co.uk/el120300-high-tension-ht-power-supply.html >>>> It supplies up to 300V at 60mA. My question is, is 60mA sufficient? >>>> - >>> >>> ** That is clearly a regulated lab supply for experiments in physics. >>> &nbsp;&nbsp;&nbsp;&nbsp; Major overkill for playing about with tube circuits. >>> &nbsp;&nbsp;&nbsp;&nbsp; Expensive too. >> >> Can you recommend an alternative? >> >>> ......&nbsp;&nbsp; Phil >>> >> >> > Hey Pete, > Read this one&nbsp; <http://education.lenardaudio.com/en/14_valve_amps_6.html>
Thank you. That's really helpful. Looking at the first circuit diagram, any thoughts about the value of the pi filter choke? Also, looking at the second circuit diagram, the swinging choke is marked 20H, but the smoothing choke has no value given. Any thought about that? -- When, once, reference was made to a statesman almost universally recognized as one of the villains of this century, in order to induce him to a negative judgment, he replied: "My situation is so different from his, that it is not for me to pass judgment". Ernst Specker on Paul Bernays