01-30-2023, 10:21 AM
FYI, the '00 gas detector is for DX at the sacrifice in gain over the 01a. Usually the 1st AF transformer is 5:1 some of the voltage loss made up by the 1st AF transformer with a sacrifice in fidelity. Same '00 is fussy about its filament voltage and grid leak resistance to achieve full sensitivity. Many 20's radio fans found the '00 difficult to keep in good, sensitive adjustment.
I suggest lighting up the converted 35 with a known '01a with good emission, even if it has to be rejuvenated.
The change from '27 to an '01a in the detector will not be noticed as any shift in tuning will go away with capacitor alignment. The 1st AF transformer is likely different plate load.
BTW, the info for A-K lube came from some original service info I found at a local A-K dealer estate.
FWIR the coils in the doner radio are binocular. These should be fine if mounted as they were in the original set. No need for the orthogonal mounting as was the 35...
The info about changing the value of the grid damping resistors in the RF can be found in some repair histories for TRF radios in Ghirardis Radio Troubleshooters Handbook.
A follow up on changing the tuning condenser array alignment frequency. "Move the frequency from 1mhz to 950 khz" . Do the opposite if the radio is more sensitive in the other direction, ie: 1050khz.
Sand paper the tips of the pins on the tubes the oxidized solder can give poor connection for RF. Re-Solder everything...
GL
Be interesting how this transplant works out.
Chas
I suggest lighting up the converted 35 with a known '01a with good emission, even if it has to be rejuvenated.
The change from '27 to an '01a in the detector will not be noticed as any shift in tuning will go away with capacitor alignment. The 1st AF transformer is likely different plate load.
BTW, the info for A-K lube came from some original service info I found at a local A-K dealer estate.
FWIR the coils in the doner radio are binocular. These should be fine if mounted as they were in the original set. No need for the orthogonal mounting as was the 35...
The info about changing the value of the grid damping resistors in the RF can be found in some repair histories for TRF radios in Ghirardis Radio Troubleshooters Handbook.
A follow up on changing the tuning condenser array alignment frequency. "Move the frequency from 1mhz to 950 khz" . Do the opposite if the radio is more sensitive in the other direction, ie: 1050khz.
Sand paper the tips of the pins on the tubes the oxidized solder can give poor connection for RF. Re-Solder everything...
GL
Be interesting how this transplant works out.
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
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