11-20-2017, 06:06 PM
P.S.
Beating on the Meissner now for the last 4 hrs trying to figure out why the FM RX level kept changing - like a drum beat - up down up down. The RSSI (eye tube) also changed.
It was the 6BE6, RF amp for AM. The filament warmed up - then opened, cooled and lit again - repeat. You would not think it would have made such a difference on the separate FM path. No wonder I can't get anything done.
In testing I see that the emissions from the tube were on - off - on faster than would be expected because of thermal inertia. So there might have been another internal intermittent, yet the result was the same and was resolved with replacement.
Two more Meissners to go. Moving on to the two 9-1093s.
Beating on the Meissner now for the last 4 hrs trying to figure out why the FM RX level kept changing - like a drum beat - up down up down. The RSSI (eye tube) also changed.
It was the 6BE6, RF amp for AM. The filament warmed up - then opened, cooled and lit again - repeat. You would not think it would have made such a difference on the separate FM path. No wonder I can't get anything done.
In testing I see that the emissions from the tube were on - off - on faster than would be expected because of thermal inertia. So there might have been another internal intermittent, yet the result was the same and was resolved with replacement.
Two more Meissners to go. Moving on to the two 9-1093s.
