Hi Andrew! Not sure I have what you seek, but found something that is simple cheap, small and according to the designer orders of magnitude quieter than best LM317 implementation. Not at the level of a Salas Shunt, but at $5 vs $75 it has a place. I have built 2. First is supplying power to my Lightspeed Attenuator and produced nice pop in SQ. Next will go onto the +5v on the 1541a, but that may be a few weeks from now. link is on TNT audio.
Simple Voltage Regulators Part 1: Noise - [English]
it is the zener emitter + follower. I use organic polymer caps. D1 sets the voltage. I used 5V zener and got stable 5v on output. Can take anything up to 75v input. Key is the low noise transistor and good caps. I plan to put them in all the key consumers on my Rotel.
Attachments
Had nothing to do so I started very modestly with the PS for the tube outputstage.
------0,1uF MKP - 510R - 4700uF------
-------GND-------------------------------
------0,1uF MKP - 510R - 4700uF------
-------GND-------------------------------
I intend to use a separate 6Vdc supply for the heaters. Will use schematic to the right(filterpart, 47R and 47nF cap across IN and GND) for NOS it's the schematic on the left. Thanks reVintage for the schematic.
Had nothing to do so I started very modestly with the PS for the tube outputstage.
------0,1uF MKP - 510R - 4700uF------
-------GND-------------------------------
Jonas HI
If that's for the HT it'll explode - please tell me this is for the heaters ONLY !!
That valve amp looks bloody great - your are so snappy with all the stuff people give you😉
Have the cans arrived yet ?
They've been gone ages - please advise.
Hi Andrew.
It's not for the heaters. ECC86 in this design is run by a 24Vdc supply. I'll use a separate 6V supply for the heaters. So R12 and that part of the schematic can be ignored.
Yes, I'm very fortunate to have very nice people around me 🙂
Hopefully there'll be something easy to fix that's wrong with the tubeamp. I'll use it as a poweramp to drive the top of my dipoles. Maybe converted from PP to SE.
No cans yet, but I had to wait 10 days or so recently for some caps to arrive from the UK. Maybe the post-system is overloaded worldwide after the Chinese new year?
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According to datasheet a maximum of 30Vdc(works with voltages much lower as it was designed for car-stereo use IIRC).
I know you meant the 63V cap, but why would it explode on a 24Vdc rail?
Edit: have a look at the schematic. PS section has R12 (20W or more) to lower the 24V to 6V for the heaters.
The schematic on the right has the filter design for oversampling on the left is non-oversampling.
I/V is passive w 50R non-inductive resistors(not shown in schematic)
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aaahhh...now I understand.
My 6N6P's run with over 250v dc and my main cap is rated at 220uf - 450V.
Hence my incorrect panic.
If I used your cap with mine it'd be a bomb😀
Know nothing about ECC88....in fact I just know nothing😉
My 6N6P's run with over 250v dc and my main cap is rated at 220uf - 450V.
Hence my incorrect panic.
If I used your cap with mine it'd be a bomb😀
Know nothing about ECC88....in fact I just know nothing😉
I thought you might have misunderstood 😉
yes a 63V cap on a 250V rail wouldn't last long 😀
It's not ECC88, that would require higher voltage, it's ECC86.
...can't even type....
It's been been a long day - just drove back from London
Almost 5 hours nearly...and here I am worrying about caps in Sweden !!
Time to go to bed I think !!
It's been been a long day - just drove back from London
Almost 5 hours nearly...and here I am worrying about caps in Sweden !!
Time to go to bed I think !!
