June 1936 Radio-Craft
[Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.
I originally stated that I could not find a single
photograph of a Crosley 6625, 3-band radio. However, RF Cafe visitor Bruce C. read that
and sent me a link to his Crosley Model 6625 being advertised for sale in the Boston area on
Craigslist (for $350 - click here to view it). A couple images of it can be seen by clicking
on the thumbnail. The Radio Service Data Sheet was part of a group of six such instances that appeared
in the June 1936 issue of Radio-Craft magazine.
Crosley Model 6625 6-Tube 3-Band Receiver
Radio Service Data Sheet
Ranges: 540 to 1,800 kc., 1,800 to 6,000 kc., 5,800 to 18,500 kc.: 685 output.
All measured on 117.5 V. line with 1,000 ohms-per-volt meter on 500 V. scale, and receiver
in operation with no input signal. All heater voltages are 6.3, except V6 which is 4.9 V.
Readings may vary plus or minus 10 per cent of values given.
For alignment, a meter must be connected between the plates of V 5 with a paper condenser
of at least 0.1-mf. in series. The I.F. amplifier is aligned at 450 kc. with the lead from
the service oscillator connected to the grid cap through a 0.02-mf. condenser, the grid clip
being left in place. Turn the station selector to about 60 on the broadcast band, and the
tone control to the left. Adjust trimmers C12 and C13 for maximum output. Transfer service
oscillator lead to cap of V1, close C10 on I.F.T. 1 so that it is moderately tight, and adjust
C11 for best as follows: Adjust C9 similarly, then place lead from service oscillator to antenna
post. Do not readjust Cl1. Set C10 to position of best output, and do not change C9 or C11.
Posted June 20, 2017