Raytheon tube program amp

[RSRecords]

I actually did find an OG output transformer but the guy wants boat money for it. More worried about a power transformer at the moment. Using this site (questionable?)https://thesubjectmatter.com/calcptcurrent.html

I come up with this:

• Selected transformer voltage: 275-0-275​

• Calculated voltage at first capacitor (B+): 352V. Subtract 6V, if using choke.​

• Calculated filament current (typically the 6.3v secondary): 2.79A​

• Calculated current: 106.81mA at 8000R load (10% plus factored in). Preamp valves current draw is estimated at typical 12AX7 max dissipation of 1.2W at 330V, i.e. 3.6mA per triode

Any thoughts?

 

[Evertide]

I miss 5 Volts for V 6...

 

[RSRecords]

yes, Power transformer needs to supply 5v for 5u4b rectifier, how does everything else look? Probably enough room for multiple transformers too.

Found these:
720v CT @ 120ma dc
5vac @ 3amp
6.3 @3.5amps

720 too high?

 

[RSRecords]

Or this.
https://reverb.com/item/78013545-rc...wer-mi-9335-tested-tube-amp-project-5u4-1960s
The tubes on an RCA mi-9335 make me think this would work. .would have to figure out mounting.

750 CT
5vac
6.3 CT

 

[Evertide]

A bit over kill : Sowter 0526 ; 375-0-375 V at 200 mA, 6.3V CT at 5A, 5.0V at 2A

 

[RSRecords]

A bit over kill : Sowter 0526 ; 375-0-375 V at 200 mA, 6.3V CT at 5A, 5.0V at 2A

ok thanks! Pretty expensive option over $400, But maybe I go that route.

I found an EDCOR that might work? Pretty similar but much cheaper, but 4-6 weeks turnaround...
https://edcorusa.com/products/xpwr035-740v-200ma-ct-6-3v-5a-5v-2a

There's also a lot of options without the 6.3vac center tap. Wonder how that connection is?

 

[abbey road d enfer]

Hammond 291AEX
You'll need to drop some voltage, though.

 

[Evertide]

How soon do you need the unit to work ?

Hammond 291AEX ; 325-0-325 or 275-0-275 at 100 mA, 6.3V CT at 2,25A, 5.0V at 3A

The center tap is connected to ground , so the filament has less hum...