Well.....
First off, nothing is broken. Gawkers can leave now!
I've been running the SB220 for about two weeks now with the Flex 5000a. In protest, the Valiant went tits up again due to hurt feelings/neglect.
Carrier level is set to 25% of maximum via PowerSDR. Here are my observations:
3300V (high tap)/3100V on TX
Power In: 100W
Power Out: 1200W -----checked very briefly. 2nd time I did this on 80m, the outboard cap arced a little. I don't do this anymore.
2600V (low tap)/2400V on TX
Power In: 100W
Power Out: 975W
Measurements taken via the metering in an SA2060 Heathkit tuna. Take that with a grain of salt.
Plate and grid seem about correct.
Tuning up on 29.000 is very persnickety/touchy.
I have been running about 200W carrier on AM. I tried 150-170W and Grant, W4BVT told me my audio actually sounded better. To get 200W, the drive is about 65W / 4 ~ 16W. To get 150W, drive is set to 45W/4 ~ 12W.
The amp seems to like running at around 150W-175W AM. My impression is that 200W for this particular unit is pushing the ragged edge and beating it up. However, with the Flex 5000 audio scheme, it can and will modulate way in excess of 100%.
Audio/signal reports have been extremely favorable......such as "I've never heard you this well before" - Liz K4GHT.
Anyway, just thought I'd pass this along. The original Eimacs seem to have a little bit of life left in them.
Philip KA4KOE
