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Philco 90 electrolytic question
Ron Ramirez
Silent Key
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Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana
#3

11-12-2008, 11:10 PM
Hi and welcome!

While the original electrolytics were 6 uF, this is no longer a standard value. You may use 10 uF, 450V electrolytics to replace the 6 uF units with no problems. Disconnect the original cans as Richard stated.

Be sure you watch polarity on these! If you look at the schematic on my website:
http://www.philcoradio.com/tech/images/90b.jpg
you will see that I have marked the positive ends for you.

In addition, note that while the negative lead of the output electrolytic (57) goes to chassis ground, the negative lead of the input electrolytic (56) goes to B-, not chassis ground. If you ground this lead, you will definitely have hum issues.

I suggest that a barely perceptible hum is acceptable; anything more indicates a problem.
--
Ron Ramirez
Ferdinand IN
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Messages In This Thread
Philco 90 electrolytic question - by Guest - 11-12-2008, 02:00 PM
Re: Philco 90 electrolytic question - by rghines1 - 11-12-2008, 06:48 PM
Re: Philco 90 electrolytic question - by Ron Ramirez - 11-12-2008, 11:10 PM
Re: Philco 90 electrolytic question - by Guest - 11-13-2008, 05:59 PM
Re: Philco 90 electrolytic question - by Guest - 11-15-2008, 02:58 AM



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