Quote:
Originally Posted by Neil Purling
The audio stage transformers are probably rubbish anyway.
Thanks anyway for the discussion.
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I think you are right there, especially the very small pcb mount transformers, might only be good for 35mW output if that. This is one thing I admire about very vintage transistor radios, they often had very impressive transformers in the audio.
Have a look at the transformers in the Pacemaker radio in figure 6 in this article, you can see the size compared to the 6V lantern battery. The driver transformer is the same size as the output transformer:
http://worldphaco.com/uploads/THE_PA..._FROM_1957.pdf
On page 7 of this Sony TR-72 article you can see the substantial transformers they used:
http://worldphaco.com/uploads/THE_SO...STOR_RADIO.pdf
Naturally these radios sound wonderful, both had rear ventilated cabinets, like many Hacker radios.