[Milsurplus] German Receivers- Audio Output Impedence?

[Bob kb8tq]

Hi

Unless it is a very unusual output circuit …. most tube audio stages act as constant current sources (even if a transformer gets involved). Tacking on a low impedance load typically isn’t going to fry the transformer or output stage. 

If you have fancy feedback paths in the circuit to reduce distortion, things can get a bit crazy. That sort of thing in a radio like this would be pretty rare.

I have no doubt that transformers do fail. The manufacturing process for them is not quite as trivial as one might think.

Bob

> On Nov 17, 2023, at 1:55 PM, Hubert Miller <Kargo_cult at msn.com> wrote:
> 
> Torn.E.b. and such receivers i have used with high impedance phones and i'm sure that is correct. All that engineering and using the wrong headphone will kill the output transformer? 
> The AFV headphones are something like 50 ohm but i would have to check. I have 3 of the Panzer crew phones that i need to sell off soon.
> -Hue Miller
> 
> 
> 
> Sent from my Verizon, Samsung Galaxy smartphone
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20231117/693cf88b/attachment.html>