Recomondations for using these transformers?

[xbart]

Any thoughts on how to use these transformers?
I have 2 output and 2 plate/filament transformers.
They were used on a military aircraft and are quite small.
Using the military spec numbers on mine, I did find a similar
versions from Triad (mine are marked Saratoga Industies).
The output transformer looks like the Triad HSM-79,
with just a 8 ohm tap. The military spec number on the
plate/filament transformer, has a similar number in the
Triad catalog but it has different specs and the Triad
model is not 50/60 cycle like mine.

These were obviously not used in a HiFi setting, but look like they
have some potential. The power tube previously used was a 6AQ5W
( I have uploaded the schem.) and looking at the specs from the Triad
catalog the output transformers might work with 2A3, 6V6 tubes also.
I'm wondering about the plate/filament transformer and the 65 MaDC
and what limitations that will have. What about some small 5 watt monoblocks?

These also had another transformer that looks like it was used at
the microphone input, how were these used and do they have any use
outside of a air raid warning system

I would like to move from the "replacing components" phase to
building phase of this hobby!

 

[battradio]

The power tansformers look good for a 6A3 or 6B4G single tube , but the frequincy responce of the outputs , would not be very good for full fedelity .If you would use the amps in a bi amp system on the bottom end would be ok , or even better in a triamp system for the mids . At 6K impeadance a 2A3 or 6A3 would be about a 3/4's of a watt . A 6V4 or 12b4 might be more cost efective and produce more power

 

[BinaryMike]

It's probably worth doing in order to gain some experience, but bandwidth will be disappointing even at half power, which is likely to be only 2W at best. The result could be reasonably satisfying on high-efficiency speakers if there's plenty of negative feedback to extend low-power frequency response. B+ voltage from that power xfmr seems too high for compatibility with a 6AQ5. There are plenty of ways to reduce it, however. The schematic apparently shows a C- supply derived by dropping some of the excess voltage across a resistor in the minus leg, but that voltage isn't used in the power amp section.

 

[Tom Bavis]

Transformers may be better than they're marked... but low frequency response is proportional to weight of the transformer inside... can make a cute little pair of monoblocks. 540VCT isn't a lot - solid state rectifier could be used.

 

[jaymanaa]

I'm thinking the outputs might be better than marked as well. I'd check them out on a scope and some square waves before passing judgement. The PT does have a 2 amp 5v tap which would run a 5R4, or 5AR4, or 5Y3.:scratch2:

 

[bricktop]

If nothing else the power transformers would be suitable for a nice preamp/linestage.

 

[Kegger]

If nothing else the power transformers would be suitable for a nice preamp/linestage.

That was my thinking, maybe even the outputs in some kinda balanced preamp?

 

[xbart]

If nothing else the power transformers would be suitable for a nice preamp/linestage.

Sounds good, my first buld will be a preamp!

Does anyone want to chime in on a good schematic for a first build.
I have read a little on the 12b4 being a good tube to build the preamp around,
would that be a good choice?
-Brad