[AMRadio] RE Apache Audio Mods

[Al Perkins]

This is not about the Apache but a G-50. When I turn it on and turn up the volumne a loud squeal and vibration comes out of the speaker even though it tunes up OK. Any ideas?


Zeke KA1KIX


 

> Date: Wed, 29 Dec 2010 17:27:24 -0500
> From: rbethman at comcast.net
> To: amradio at mailman.qth.net
> CC: knjhanlon at msn.com
> Subject: Re: [AMRadio] RE Apache Audio Mods
> 
> I agree totally with Jim on this one!
> 
> Bob - N0DGN
> 
> On 12/29/2010 5:05 PM, JAMES HANLON wrote:
> > Lee W0VT wrote
> >
> > "I also heard the interstage audio transformer iron core is terrible.
> > Antique Electronic Supply sells a replacement interstage audio transformer
> > with much better iron. It in itself will improve the rigs audio."
> >
> > Ken Morgan, KC5DW, who only replaced the two 510 pf interstage coupling capacitors with .0047 mfd units measured the low frequency 3 dB point with his mod to be about 200 Hz. He was measuring between the microphone input and the modulator tube grids, which includes the interstage audio transformer. That would certainly indicate that the transformer has sufficient low frequency response. I would recommend trying just the capacitor replacement first and seeing how that sounds before I did anything else.
> >
> > Jim, W8KGI
> 
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