QRZ Forums - "Boat Anchor" & Classic Equipment for Saturday 4 March 2017
 

"Boat Anchor" & Classic Equipment

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Heathkit SB-303 hum

Posted: 04 Mar 2017 06:33 AM PST
http://forums.qrz.com/index.php?thre...03-hum.554297/

I am working on my Heathkit SB-303. I recently (Thursday 2/2) got it
working again after replacing many bad transistors, caps & resistors;
however, there is still a hum on the audio & before the S-meter quit
working, it was reading a steady 40 over 9. Before anyone asks, yes, there
are new caps on the power supply board (2 1000mF vs. the original 2000mF as
my local store doesnt sell 2000mF caps & Mousers website is horrible). Has
anyone else had this problem of where else the hum could be...



Heathkit SB-303 hum

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Great find today, LCR meter (Impedance Bridge) 1956

Posted: 04 Mar 2017 04:05 AM PST
http://forums.qrz.com/index.php?thre...e-1956.557680/

Today I was scouting for "cool stuff" and searching the local thrift
stores. I found this impedance bridge, with original manual hidden away on
a bottom shelf!



Its an LCR meter (Inductance, Capacitance, Resistance, Reactance, and
ESR). Interesting that it will measure inductors from 1 uH to 1100 H.



Looks like it was used by "Crescent Communications Corp" at one time, made
by Electro-Measurements, Inc. Last maintenance was May 1978.



I see them still for sale for around $150, but I...



Great find today, LCR meter (Impedance Bridge) 1956