hi Salas
i am wondering if i could still power the shunt reg with tube regulator i am using now? its EZ81 (max current is 150 according to link below). will it capable to supply the current the shunt reg needed and dissipated?
http://www.mif.pg.gda.pl/homepages/frank/short/001/e/EZ81.gif
i am wondering if i could still power the shunt reg with tube regulator i am using now? its EZ81 (max current is 150 according to link below). will it capable to supply the current the shunt reg needed and dissipated?
http://www.mif.pg.gda.pl/homepages/frank/short/001/e/EZ81.gif
Hi,
Seems to me Lynn Olson employ shunt tube regulators in his preamp
see here http://www.nutshellhifi.com/triode1.html
Paolo
Seems to me Lynn Olson employ shunt tube regulators in his preamp
see here http://www.nutshellhifi.com/triode1.html
Paolo
milen007 said:
Share one for both channels, post#2 schematic. If you want to make double mono PSUs keep it as is, triple current is better.
You can use any tube rectifier. Only calculate the mains transformer and rectifier drop for ICCS current correctly, so to always have a DC in that must be about 50V more than needed output.
Use a small one that will not saturate at nominal Reg current draw. A few H with low DCR so to not lose voltage. Or CRC with 220R. In general the ICCS in the reg keeps the ripple out. It only needs to be some logical ripple magnitude. Only be sure of what raw DC value you are going to end up feeding the reg with. A simple way to be safe when deciding about transformer and pre filter is to simulate in Duncan's free PSU simulator. Google for it, if are not already using it.
milen007 said:
I was planning on ordering only a few pcbs for personal use. If you want some, you can order a batch from http://www.expresspcb.com and use the file I have attached in a previous post. Be warned that I'm a newbie to this and have not real-world tested it yet!
Yep, you will get 3 boards delivered to your door for $60.85 in the US. I'm not sure what the costs are in other countries is, but the Express PCB program will tell you.
A trick to do on the mini board service is to add the component designators to the top copper layer to help with placing components. Also, you have a lot of space on the board. You can most likely scrunch the parts together on half the board, then copy/paste a second image of the board on the other half. Then you get 6 boards for the price of the mini board service. Just takes a pair of large hand shears to cut the boards apart.
For ideas on top copper layer circuit designators and multiple images on mini boards see the down load area on my web page.
Gary P's DIY page
A trick to do on the mini board service is to add the component designators to the top copper layer to help with placing components. Also, you have a lot of space on the board. You can most likely scrunch the parts together on half the board, then copy/paste a second image of the board on the other half. Then you get 6 boards for the price of the mini board service. Just takes a pair of large hand shears to cut the boards apart.
For ideas on top copper layer circuit designators and multiple images on mini boards see the down load area on my web page.
Gary P's DIY page
wuffer said:Thanks
The R1 sets the mA
The p1 on the boards is the trim??
Is it ok to use 1 board for each channel and only 1 transformer??
How much current do you think should be used for 2 6922 tubes pr channel?? (vacuumstate svp1)
The p1 is the trim. I'll leave it to the more technically knowledgeable to answer the other Qs...
See posts #3 & # 7 about what does what and how to set it.
It is OK to use one trafo and two regs. Better still, use one trafo with double secondaries and two rectifiers. Closer to double mono.
There can be many ways of running such tubes. Better read the brand's website or ask Allen Wright so to know exactly. A general third party guess without pointing us to the schematic, would be ''relatively low current, 10-20mA channel total''.
It is OK to use one trafo and two regs. Better still, use one trafo with double secondaries and two rectifiers. Closer to double mono.
There can be many ways of running such tubes. Better read the brand's website or ask Allen Wright so to know exactly. A general third party guess without pointing us to the schematic, would be ''relatively low current, 10-20mA channel total''.