I am rebuilding a st-70 and I'd like to know what is the current pulled on the B+ rail? Using EL34 tubes biased normally. At what voltage, using a stock PA-060 transformer? Thanks in advance for the help.
2 posters
B+ current
peterh- Posts : 1869
Join date : 2012-12-25
Location : gothenburg, sweden
- Post n°2
Re: B+ current
Using dynaco's own documentation; page 6 mentions that bias is adjusted totubesman wrote:I am rebuilding a st-70 and I'd like to know what is the current pulled on the B+ rail? Using EL34 tubes biased normally.:confused: At what voltage, using a stock PA-060 transformer? Thanks in advance for the help. :)
100mA per pair, that's 200mA, then a guess that each 7199 will eat 10mA , in total 220 mA
tubesman- Posts : 5
Join date : 2010-10-14
- Post n°3
Re: B+ current
Using dynaco's own documentation; page 6 mentions that bias is adjusted to
100mA per pair, that's 200mA, then a guess that each 7199 will eat 10mA , in total 220 mA
[/quote]
That sounds like the current that the tubes are biased at. I'd like to know the full power current drain at rated output. Sorry I didn't make that more clear. I am using PSDII. I made measurements on the transformer to estimate, as closely as possible, the PS output voltage at full load. I need to squeeze as much voltage as possible out of the PS to handle my driver stage, not a 7199. BTW, thank you for your reply.
100mA per pair, that's 200mA, then a guess that each 7199 will eat 10mA , in total 220 mA
[/quote]
That sounds like the current that the tubes are biased at. I'd like to know the full power current drain at rated output. Sorry I didn't make that more clear. I am using PSDII. I made measurements on the transformer to estimate, as closely as possible, the PS output voltage at full load. I need to squeeze as much voltage as possible out of the PS to handle my driver stage, not a 7199. BTW, thank you for your reply.