[ARC5] BC-453 drift test

[David Stinson]

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of J Mcvey via ARC5
Subject: Re: [ARC5] BC-453 drift test

 

The reduced B+ may be a good idea, but these radios are running on the original dynamotors.

 

On that theme, I was considering building fet and mosfet substitute solid state replacements into octal sockets for plug-in replacements.

Then I run the B+ on 24V.

The only problem will be getting audio power out of  the audio output section.

One rube-goldberg setup might be using a standard audio power IC and a matching transformer  to match the original plate impedance.

A less bulky idea might be to have a local voltage boost for the 12A6 tube only, which will supply 100v or so to a push pull power amp.

Fortunately the 24V can be picked off of the 12a6 heater pin.

 

Any other ideas?

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I’ve recently acquired some of these teeny Class D audio amps, similar to these:
https://www.ebay.com/itm/222596016494

About the size of a postage stamp, but have not yet started to experiment with them.
Search “class d audio” for many options.

Anyone else?

 

 

 

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