Getting organized on my end re/the R390A. Thought the list below might be useful - tube listing keyed to the diagrams in the Y2K manual, chapter 5 Also a list of tubes for a spare set and a list of tubes for a test set (spacing came out a little wonky due to the transition from WORD to Yahoo text)
RF DECK (Y2K Manual, pg. 5-15, clockwise from upper left)
V206 100Kc Multivibrator 5814A
V205 100Kc Cathode Follower 5814A
V207 1st Crystal Oscillator 5654/6AK5W
V204 3rd Mixer 6C4
V203 2nd Mixer 6C4
V202 1st Mixer 6C4
V201 RF Amplifier 6DC6
CRYSTAL OSCILLATOR SUBCHASSIS (Y2K Manual, pg. 5-17)
V401 2nd Crystal Oscillator 5654/6AK5W
IF DECK (Y2K Manual, pg. 5-18, clockwise from upper left)
V502 2nd IF Amplifier 5749/6BA6W
V503 3rd IF Amplifier 5749/6BA6W
V506 AGC Time Constant & Detector 5814A
V504 4th IF Amplifier 6AK6
RT510 Current Regulator 3TF7
V505 BFO 5749/6BA6W
V508 AGC IF Amplifier 5749/6BA6W
V507 Limiter 5814A
V509 AGC Rectifier & IF Cathode Follower 5814A
V501 1st IF Amplifier 5749/6BA6W
VFO SUBCHASSIS (Y2K Manual, pg. 5-19)
V701 Variable Frequency Oscillator 5749/6BA6W
AF DECK (Y2K Manual, pg. 5-20, clockwise from upper left)
V601 1st AF Amplifier & AF Cathode Follower 5814A
V605 Voltage Regulator 0A2
V602 Local AF Amplifier & Line AF Amplifier 5814A
V604 Local AF Output 6AK6
V603 Local AF Output 6AK6
POWER SUPPLY SUB-CHASSIS (Y2K Manual, pg. 5-21, left to right)
V802 Rectifier 26Z5W
V801 Rectifier 26Z5W
FULL SET OF SPARE JAN TUBES
1 ea. 0A2 3 ea. 6C4 2 ea. 5654/6AK5W
1 ea. 3TF7 1 ea. 6DC6 6 ea. 5749/6BA6W
3 ea. 6AK6 2 ea. 26Z5W 6 ea. 5814A
JAN TUBE TEST SET (approx. N-1 tubes, as suggested)
2 ea. 6AK6 (min# 1 ea.) 1 ea. 5654/6AK5W
2 ea. 6C4 5 ea. 5749/6BA6W (min# 4 ea.)
1 ea. 26Z5W 5 ea. 5814A (min# 3 ea.)
-- Steve
Woodinville, WA
If you can read this, thank a teacher; if you're reading this in English, thank a military veteran.
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