07-27-2014, 10:42 PM
I'm working on an Atwater Kent model 20C 7570 and am wondering what the plate voltage to ground should be for the UV (or UX) 200 & 201 tubes? I'm measuring 27 DC Voltage on the 200 and 94 - 97 DC Voltage on the 201 tubes. The 201's seem right where they should be, as I'm using an ARBE III Battery Eliminator and the B voltage is set for 90.
Here's a link to a PDF file of the schematic:
http://www.atwaterkent.info/TechData/Dra...570sch.pdf
I had to replace both audio interstage transformers with the P-T156's available from Antique Electronic Supply. If the secondary of the audio interstage transformer's polarity is reversed or in the opposite direction of the primary, is that critical?
And for the ARBE III Battery Eliminator if interested:
http://www.arbeiii.com/
Many thanks for any help you can provide.
Here's a link to a PDF file of the schematic:
http://www.atwaterkent.info/TechData/Dra...570sch.pdf
I had to replace both audio interstage transformers with the P-T156's available from Antique Electronic Supply. If the secondary of the audio interstage transformer's polarity is reversed or in the opposite direction of the primary, is that critical?
And for the ARBE III Battery Eliminator if interested:
http://www.arbeiii.com/
Many thanks for any help you can provide.
Greg V.
West Bend, WI
Member WARCI.org
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