Are these useful? utc s29 transformer

[djn]

I found 2 utc s29 transformers but don't know what to use them for

 

[HollowState]

UTC "S" numbers are from the "special series" of transformers. Your S-29s are chokes rated at 6 Henerys, 175 mA, 90 ohms w/1500v insulation. This is per my massive mid sixties Radio Electronic Master cataloge.

 

[djn]

So would they be good in a power supply for a high powered amp? I also got a 350-0-350 power transformer with a couple 5v taps and a coupled 6.3 taps.

any idea what these might work well in?

 

[Eli Duttman]

So would they be good in a power supply for a high powered amp?

The rated 175 mA. is barely adequate for a stereoblock employing 4X "12" W. tubes. However, you have 2 chokes. 🙂 Build a pseudo dual mono B+ PSU that shares the 1st filter cap., but employs separate LC reservoir sections.

 

[djn]

Thanks Eli. I was thinking of a SET amp but I don't know design. I can build anything but understand what 175ma means. When you say "12" W tubes, what does that refer too?

Here is a screenshot of the transformer I have. It is a Thordarson T-70R62. I "think" I have a pair of output transformers hold up in a box somewhere. But I don't know if they are PP or SET.

 

[djn]

Speaking of D.C. mAmps, the tranny is 700 volts CT with 145 mA DC. Is that enough?

 

[Eli Duttman]

The 6BQ5 and 6V6 are "12" W. tubes.

SET amp, hmmm. The Sovtek 2A3 is tougher than NOS. Those would be your "finals". Use a 5R4 rectifier, for its (beneficial in this case) large forward drop into a small 1st filter cap. of (WAG) 2.2 μF. and on to the paired LC reservoir sections.

 

[djn]

Thanks Eli. I have a stash of AZ1 rec tubes with sockets. How would one if those work if I knock the 5v to 4v?

Does the "12" refer to the heater voltage?

 

[Eli Duttman]

The "12" W. refers to allowable plate dissipation. High power requires high current and that Thordarson "iron" can't deliver it.

Save the AZ1s for another time. Jim McShane charges $12.50 for a well tested 5R4WGB ("potato masher").

 

[djn]

I just looked up plate disappation and the 6v6 has 9.5 watts compared to 125 watts of my GM70! I think I'll pass on this box of stuff.

I use the 5R4WGB in my Pete Millet low-mu pre amp. It sounds great.