zenith amp

diesel_tech · 9th October 2007, 03:35 AM

A friend gave me this amp from an old tv.

http://techpreservation.dyndns.org/s...SRS10_178.djvu

I think it has some potential, i haven't powered it up yet, needs some new filter caps. I was thinking os using a better O/P transformer, the current one is , well, small. Also thinking of trying it in UL. Any other thoughts on it?

Thanks
Jeremy

planet10 · 9th October 2007, 07:12 AM

what are you going to use it for?

The amp can be simplified,,, and the phase splitter improved. I'd play with the circuit before i swaped OPTs...

dave

diesel_tech · 10th October 2007, 01:06 AM

I'm going to be listening to a little of everything, but more rock than anything. What would you suggest to simplify it?

planet10 · 10th October 2007, 01:51 AM

First you make sure it works (clean up the PS, replace dud parts)... then you could try tapping the input to the grid of the 1st 'AU7 (bypassing the tone controls). Next i'd change the phase splitter.

dave

diesel_tech · 14th October 2007, 01:15 AM

I'll give it a try, i'm hoping to have it monday.

Thanks
Jeremy

diesel_tech · 21st October 2007, 06:26 PM

Well i did get th amp, and i replaced the filter caps, and the foil caps with new ones. I still have a sporadic crackling noise. THe only caps i did not change were a couple of ceramin disc caps, and tubular style ceramic caps. The tubular caps i know from expirience do not go bad very often, i have a radio from 1932 that still has them, and are still dead on for value, the disc caps i'm not so sure about. Any suggestions?

Thanks
Jeremy

adason · 22nd October 2007, 01:34 AM

Quote:

sporadic crackling noise

that is most likely coming from poor contact between tube pins and sockets, see if deoxying it helps

9th October 2007, 03:35 AM	#1
diesel_tech diyAudio Member Join Date: Dec 2006 Location: Sterling, CO	zenith amp A friend gave me this amp from an old tv. http://techpreservation.dyndns.org/s...SRS10_178.djvu I think it has some potential, i haven't powered it up yet, needs some new filter caps. I was thinking os using a better O/P transformer, the current one is , well, small. Also thinking of trying it in UL. Any other thoughts on it? Thanks Jeremy

9th October 2007, 07:12 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	what are you going to use it for? The amp can be simplified,,, and the phase splitter improved. I'd play with the circuit before i swaped OPTs... dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

10th October 2007, 01:51 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	First you make sure it works (clean up the PS, replace dud parts)... then you could try tapping the input to the grid of the 1st 'AU7 (bypassing the tone controls). Next i'd change the phase splitter. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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10th October 2007, 01:06 AM	#3
diesel_tech diyAudio Member Join Date: Dec 2006 Location: Sterling, CO	I'm going to be listening to a little of everything, but more rock than anything. What would you suggest to simplify it?

14th October 2007, 01:15 AM	#5
diesel_tech diyAudio Member Join Date: Dec 2006 Location: Sterling, CO	I'll give it a try, i'm hoping to have it monday. Thanks Jeremy

21st October 2007, 06:26 PM	#6
diesel_tech diyAudio Member Join Date: Dec 2006 Location: Sterling, CO	Well i did get th amp, and i replaced the filter caps, and the foil caps with new ones. I still have a sporadic crackling noise. THe only caps i did not change were a couple of ceramin disc caps, and tubular style ceramic caps. The tubular caps i know from expirience do not go bad very often, i have a radio from 1932 that still has them, and are still dead on for value, the disc caps i'm not so sure about. Any suggestions? Thanks Jeremy

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