Don't trust a tube tester, especially since the tube tester checks at DC and cannot test a tube as an oscillator at like 100 MHz!
Try a couple of different tubes in the oscillator and then see what happens. Glen, K9STH Website: http://k9sth.com On Wednesday, April 16, 2014 2:01 PM, "[email protected]" <[email protected]> wrote: No answers from other groups (incl. Heath), thought someone here might know.... Got this SG-8 out of 5-year storage, cleaned it up, lubed/cleaned the switches, pots, tested the tubes, etc etc.....and it all works fairly well for what is it...but Band "E" is extremely erratic. A thru D are fine. Have tried numerous fixes, tightened ground bolts, touched up fudgy solder joints....no go. Can sometimes get a squawk out of it around 40 Mhz or so... _ if I happen to bend the coil sub-chassis a bit towards the front panel_....but it's very unreliable, not a permie fix. Switched tubes, too, just for grins...no luck. Clue: The fellow who had this before me put in a 1Meg ohm pot in the audio gain position _with no on/off switch_ (orig. was 1 meg too)...can hardly see how this could affect the case, but...that band "E" is nasty...all it used is the bus bars for inductance, methinks. Anyone have a similar issue and fix it with this generator? All tubes tested fine on a Hickok 539B. Tnx, Lin/KJ6EF _______________________________________________ Boatanchors mailing list [email protected] https://puck.nether.net/mailman/listinfo/boatanchors _______________________________________________ Boatanchors mailing list [email protected] https://puck.nether.net/mailman/listinfo/boatanchors
