The Power supply tranny thread

[pula58]

I thought it might be incredibly useful for many if we could list our results with various power supply trannies:

Company and model #
tubes being powered
rectifier
Resulting B+ voltage
runs cool/runs hot
your AC wall voltage
problems (if any)

my 1st example:
Hammond 272HX4 6V6 (90m total plate current) and 4 12AX7's (another 10mA or so)
full-wave rectified, diodes.
430V
power tranny runs pretty cool. I can hold it indefinitely without discomfort.
120V wall voltage.
no problems.

2nd example:
Hammond 291EX
2 6L6GC and 4 12ax7.
full wave rectified, diodes.
460V
runs cool !
120V wal voltage
some buzzing, the lamination bolts may need tightening.

[Gaz]

watching this thread with great interest....

and pula58, could you add the unrectified HV for reference?

Magnetic Components

40-18053

4 EL34, 3 12AX7

FWB

350-0-350 AC

475-480VDC

Runs hot to touch with M6 upgrade version
Runs extremely untouchable hot with non-M6 version (company claims no failures ever because of properly rated materials)

120

Problems: keep getting more expensive, and will no longer be competitively priced.

[Jack Hester]

Company and model #:Hammond 290DX
tubes being powered: 6SJ7, 6SL7, 6SN7x2, 6L6x2
transformer secondary AC: 325v-0-325v (367.3v-0-367.4v actual)
rectifier: 5Y3 Full Wave Rectifier
Resulting B+ voltage: 464.1v
runs cool/runs hot: Nice and warm; Never hot
your AC wall voltage: 118-120v
problems (if any): None

Jack

[Structo]

Company and model # Magnetic Components #40-18004 Fender Twin PT
Tubes being powered 3x 12AX7, 4x 6L6GC (Dumble ODS clone)
Rectifier FW diode[/b
Resulting B+ voltage 435vdc
Runs cool/runs hot, runs fairly warm but not too hot to touch.
AC wall voltage 118-120vac
Problems (if any) This PT has a bit of induction noise, low hum.

[pula58]

Thanks folks.
Anyone else want to join-in and share some info?


Thanks!!

P.

[leadfootdriver]

Classic Tones for the Express.

123 VAC

UF5408 diodes

403 VDC at the 1st filter cap

401 VDC at the power tube plate pulling 42.6 MV's of cathode current for about 17 watts.

JJ ECC803S's and JJ KT77's.

Runs real cool. The PT has a small amount of mechanical hum like all PT's, but it doesn't come thru into the audio. My amp only has the typical hiss, but no hum.