Re: Running Old Bassman @ 8 ohms safe?
- From: Kingfish <Nospam@xxxxxxxxxxx>
- Date: Sun, 6 Dec 2009 01:12:22 -0600
Top Post -
Thanks LV - thats why I ask here, before I even attempt - think I'll just leave this amp Alone, I have several other heads I can experiment with my Single 12 Cabinet - thanks everyone in this whole thread for jumping in.
On 2009-11-20 17:52:05 -0600, Lord Valve <detritus@xxxxxxxxxxxxx> said:
You risk a condition known as high tension flyback.
This will arc one of the tube sockets (and, rarely,
bofubm) and also kill the tube in that socket. Once
this happens, the plastic of the socket will become
conductive (between pins 2 and 3) and it'll be easier
for it to happen again and again. This can kill not
only the output transformer, but the power transformer,
as the arc is from the plate winding in the OPT to
the filament winding in the power transformer. It's
most likely to occur when playing at high volume
with lots of treble.
If you've been running your amp that way, I suggest
you eyeball the power tube sockets (and the bottom
of the power tubes) - you're looking for a small brown
mark between the #2 and #3 holes (or tube pins).
It can also be a powdery-looking grey color (like
ash, which is what it is) or even a massively cooked-
looking crater between the pins. If you see this, you
*must* replace the socket *and* the tube. You can't
scrape it off, so don't try. And also be aware that
the arc may occur *inside* the tube base, where you
can't see it, or on the rear (terminal) side of the
sockets, where it's hard to see.
Run that amp at the rated load, period.
Good advice, from an obvious expert..... Taken.
Lord Valve
Expert (please obsess)
--
Kingfish
.
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