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Philco 90 with Twin 47 Tubes in PP
#5

joybird Wrote:Does not JIVE.

Definitely not! The 90 with 2-47 outputs uses the same type of autodyne oscillator circuit as the 71, 91, 19, 89 and a few others. Yup, the very same circuit that has made many a young man's hair turn gray.

That circuit must have the 700 pF cap (13) and a 10K (or better yet, an 8.2K) resistor in place of the factory-designated 15K (14). The det-osc tube (24) will not oscillate without the 700 pF cap, and it most assuredly will not work with a 56K in place of the 15K.

3615-AJ - part (9) on schematic - should definitely be dual .05 uF, not dual .09. I see the schematic on my site erroneously states .09 uF, as does the Rider data (which is the factory data from Philco).

Another "OOPS" moment brought to you by Philco. Icon_rolleyes

--
Ron Ramirez
Ferdinand IN


Messages In This Thread
Philco 90 with Twin 47 Tubes in PP - by joybird - 05-05-2014, 12:00 PM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-05-2014, 03:39 PM
RE: Philco 90 with Twin 47 Tubes in PP - by Ron Ramirez - 05-05-2014, 04:46 PM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-05-2014, 04:55 PM
RE: Philco 90 with Twin 47 Tubes in PP - by Arran - 05-05-2014, 06:23 PM
RE: Philco 90 with Twin 47 Tubes in PP - by Arran - 05-05-2014, 07:05 PM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-05-2014, 07:45 PM
RE: Philco 90 with Twin 47 Tubes in PP - by gregb - 05-05-2014, 09:45 PM
RE: Philco 90 with Twin 47 Tubes in PP - by gregb - 05-05-2014, 09:49 PM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-05-2014, 10:37 PM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-07-2014, 02:21 PM
RE: Philco 90 with Twin 47 Tubes in PP - by Arran - 05-07-2014, 11:48 PM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-14-2014, 11:15 AM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-14-2014, 02:11 PM
RE: Philco 90 with Twin 47 Tubes in PP - by gregb - 05-14-2014, 04:22 PM
RE: Philco 90 with Twin 47 Tubes in PP - by morzh - 05-15-2014, 01:26 PM
RE: Philco 90 with Twin 47 Tubes in PP - by Arran - 05-16-2014, 01:09 AM
RE: Philco 90 with Twin 47 Tubes in PP - by Arran - 05-17-2014, 02:40 AM



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