Hello Bill!
On 26 Dec 97, Bill Riley wrote to Duncan Markley:
 BR> That's a relief.  My old reverb unit went belly up while our bass player
 BR> had it plugged into the mixer.  I can't even afford to have it looked at
 BR> for a couple of months.  It baffled Rich when he was up here, soooo.
And after looking at the schematic, I'm even more baffled.  +24v on the grid 
of that first triode would dump B+ to ground through a total of 121.5k... 
even if the B+ level is 500 volts (which would toast a 6K6 or 6V6) the 
current would only be FOUR frigging milliamps... probably well under 10% of 
the rating of the transformer.  If the voltage is lower, the current would be 
lower.  It wouldn't cause anything farther down the line to draw excess 
current because dumping B+ at the first triode kills the grid to the second 
triode, causing it's plate to go to full B+, which feeds the 6K6 through a 
cap, which has no AC going through it to cause any drain in the 6K6.
UNLESS... I hadn't thought of this earlier... if the polarity on the phantom 
power were reversed (or AC), there are three 25uf electrolytic caps on the 
cathodes plus three 40uf caps on the power supply that could be damaged by 
the positive voltage on the ground rail.  The three power supply caps are 
probably okay, because +24v on the ground rail wouldn't reverse-bias them 
compared to the B+ line, but the cathode caps would more than likely have 
been reversed. Damage to them may not be visible or smellable.
The only thing that explains the power transformer running hot is damage to 
one
or more of the three power supply caps (not likely) or the screen on the 6K6 
leaking to ground through the cathode.
The first thing I would do is pull all of the tubes, power it up, and see if 
it gets hot.  If so, then one of the power supply caps may be leaking.  If 
not, start plugging in tubes, first, the last 12AX7, then the 6K6, then the 
first 12AT7, waiting a while and checking for heat after plugging in each 
e.
The second thing I would do is retube the whole thing on the chance that the 
6K6 is shorted.  Call Jim at AES for an NOS 6K6... it should be cheaper than 
an NOS 6V6 because they aren't really common or in demand for hi-fi or guitar 
amps.  If I build a reverb unit, it'll use the 6K6.
C-ya! Rich
--- GoldED 2.40
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