SSLV1.1 builds & fairy tales

[watchal]

I design for 6ak5,ef95,6j1 really amazing cheap tube preamp.

 

[Salas]

Good.

 

[Salas]

And you get some subjective performance upgrade by using such wasteful for heat shunt regulators on 10mA bias tubes?

 

[watchal]

sorry I forgot signal ground in the picture above -42 are connect to R cathod.
I like to know what the best ccs current 3-4 time than real actual use . that enough ? And high ccs VS low ccs which good for sound performance.

 

[watchal]

And you get some subjective performance upgrade by using such wasteful for heat shunt regulators on 10mA bias tubes?

just would to know how high it can go with good supply .
now it can stand nearly 5000 us market preamp. I don't fake .

 

[Salas]

sorry I forgot signal ground in the picture above -42 are connect to R cathod.
I like to know what the best ccs current 3-4 time than real actual use . that enough ? And high ccs VS low ccs which good for sound performance.

Don't use lower than 100mA CCS because its good for the regulator itself even when you need just 10mA. If needing 100mA Iq then 200mA is good and 300mA even better for example.

 

[Salas]

just would to know how high it can go with good supply .
now it can stand nearly 5000 us market preamp. I don't fake .

So you did not try it with the new shunt PSU yet? Or you did?

 

[watchal]

connected now great upgrade.

 

[Salas]

connected now great upgrade.

Good for you. Bravo.

Where did you get that red reg board? Is it a commercial clone of my design that some shop sells?

 

[watchal]

sorry i dont know my friends give to me

now I put r101 with 20r is Ok measure 120 ma ccs

thanks for advise

 

[Salas]

Tell your friends Salas will come to Thailand to hunt them with big hot heatsink axe if they sell black market clones.

Yes 120mA is much better. Did you measure temperature on the sinks now? Having thermometer gun or thermo-probe?

 

[watchal]

no have thermometer
now heat is slowly rising not quick as R101 =4.7 ohm
but still hot with my size of heat zinc.

 

[Salas]

If not terribly hot leave it there, else cut about 20mA more with 10% higher current setting resistor.

 

[voxxonline]

Assembling kits with no alterations is one thing but choosing your own components is there I need to ask for a help please
If I need for instance 18v 60ma Max current draw I will use:
Transformer with 5v extra headroom so let's say 2x12 secondaries would give over 33 vdc
Target v is 18 and 60ma with excessive headroom of 100ma, total 160ma
I d use 2 red and 3 green LEDs, will check Vf later.
R103 would be something like 2k5 and trimpot 1k
R101 11.8 r with 1 w rating
Is this correct ?

 

[Salas]

18V to 33VDC gives enough drop over the reg to created non needed dissipation, could be 28V but if its that transformer available, oh well. Buy a 10R and 8R2 too for R101 bcs 3 Leds aren't usually much high total Vf.

 

[voxxonline]

Thank you. Because voltage is +- 3 v of 15 v and normally device is powered with batteries i thought it would be ok to go for 18v too. But if i lower it to 15 as average i can choose 2x9 transformer. It will reduce excessive dissipation ..
Which will give approx 22 vdc
With same 160 ma
There i d choose 1k8 for r103 and trimmer is 1k
R101 is 11.8 r or to buy your suggested resestance ?
Is enclosure floor is enough for dissipation ?

 

[Salas]

If you don't know the LEDs Vf you can't forecast the current setting, but 4 greens are more likely with that 11.8 for over 100mA CCS. Floor mounting should be sufficient.

 

[voxxonline]

I ll check Vf tonight. I really want to understand how it operates

 

[Salas]

Practice will reveal its very intuitive when you will set it up and see the relations on the DMM. Its just not the classic way.

 

[Vbenonisen]

Hello!
I've been building the Salas low voltage regulator with the BJT minikit for the purpose of powering my USB-module (5V/0.5A). Everything is built according to the manual (Appendix 1a) with selected 2SK117 (3,4 and 5 mA).
The problem however is that I'm not able to adjust the 1K resistor to the appropriate 5V out. Everything works great up to 4.7V but no further. I've tried different transformers with different voltages with very little change.
Any solutions - anybody?
Best regards, and Merry X-mas!
Vidar