Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Harma 6L6GCSTR valve problem

So called Superior Grade Cryo
Work ok and test ok but in use and the tester there is low
insertion/extraction force in the sockets. Dragon's teeth hold them in place
ok, so will not fall out. Measuring the pin diameters about 2.15 mm compared
to a random selection of others laying around of 2.3mm. Known problem ? or
leave alone or squash the pins a bit , perpendicular to the base forks gap ?
and colateral damage ?
These are from Peavey Deuce with final IC before the valves is corrupt so
possibility of intermittant valve action feeding spikes back into the
preamp ? no abnormal use admitted to , to have occassioned the IC failure


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Default Harma 6L6GCSTR valve problem


"Nutcase Kook"


These are from Peavey Deuce with final IC before the valves is corrupt so
possibility of intermittant valve action feeding spikes back into the
preamp ?



** WTF are you an about ???

The Peavey Deuce VT has a pair of transistors driving the output valves -
from a 300 volt DC supply.

Wot a bloody lunatic.



..... Phil


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Default Harma 6L6GCSTR valve problem

N_Cook wrote:

So called Superior Grade Cryo
Work ok and test ok but in use and the tester there is low
insertion/extraction force in the sockets. Dragon's teeth hold them in place
ok, so will not fall out. Measuring the pin diameters about 2.15 mm compared
to a random selection of others laying around of 2.3mm. Known problem ? or
leave alone or squash the pins a bit , perpendicular to the base forks gap ?
and colateral damage ?
These are from Peavey Deuce with final IC before the valves is corrupt so
possibility of intermittant valve action feeding spikes back into the
preamp ? no abnormal use admitted to , to have occassioned the IC failure



I don't see any IC's there? I do see a pair of transistors that may be
suffering.

Report back when you can determine the type of damage the transistors
are getting, which one, and how was it damaged? collector short, base to
emitter short? no gain? etc,,,,

Jamie





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Default Harma 6L6GCSTR valve problem

Jamie t wrote in message
...
N_Cook wrote:

So called Superior Grade Cryo
Work ok and test ok but in use and the tester there is low
insertion/extraction force in the sockets. Dragon's teeth hold them in

place
ok, so will not fall out. Measuring the pin diameters about 2.15 mm

compared
to a random selection of others laying around of 2.3mm. Known problem ?

or
leave alone or squash the pins a bit , perpendicular to the base forks

gap ?
and colateral damage ?
These are from Peavey Deuce with final IC before the valves is corrupt

so
possibility of intermittant valve action feeding spikes back into the
preamp ? no abnormal use admitted to , to have occassioned the IC

failure



I don't see any IC's there? I do see a pair of transistors that may be
suffering.

Report back when you can determine the type of damage the transistors
are getting, which one, and how was it damaged? collector short, base to
emitter short? no gain? etc,,,,

Jamie







The 300V transistor pair are ok , as is the clean channel prea.


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Default Harma 6L6GCSTR valve problem



--
--
N_Cook wrote in message
...
So called Superior Grade Cryo
Work ok and test ok but in use and the tester there is low
insertion/extraction force in the sockets. Dragon's teeth hold them in

place
ok, so will not fall out. Measuring the pin diameters about 2.15 mm

compared
to a random selection of others laying around of 2.3mm. Known problem ?

or
leave alone or squash the pins a bit , perpendicular to the base forks gap

?
and colateral damage ?
These are from Peavey Deuce with final IC before the valves is corrupt so
possibility of intermittant valve action feeding spikes back into the
preamp ? no abnormal use admitted to , to have occassioned the IC failure



Marking a line outside of the socket base perpendicular to a fork,
transfering a line to the valve base to get the correct "reversed"
orientation . Then a 1.9mm rod as a stop in the jaws of parallel action
pliers deformed the pins to elliptical axes of 2 and 2.3mm in the right
sense to increase the grip.




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Default Harma 6L6GCSTR valve problem

On Wed, 14 Sep 2011 14:46:39 +0100, N_Cook wrote:

So called Superior Grade Cryo
Work ok and test ok but in use and the tester there is low
insertion/extraction force in the sockets. Dragon's teeth hold them in
place ok, so will not fall out. Measuring the pin diameters about 2.15
mm compared to a random selection of others laying around of 2.3mm.
Known problem ? or leave alone or squash the pins a bit , perpendicular
to the base forks gap ? and colateral damage ?
These are from Peavey Deuce with final IC before the valves is corrupt
so possibility of intermittant valve action feeding spikes back into
the preamp ? no abnormal use admitted to , to have occassioned the IC
failure


Never had problems with Peavey sockets even on a VX VTR series that blew
one of the drivers. Replace with a pair of MJE13003 and the rest is
history.



--
Live Fast Die Young, Leave A Pretty Corpse
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Default Harma 6L6GCSTR valve problem

Meat Plow wrote in message
...
On Wed, 14 Sep 2011 14:46:39 +0100, N_Cook wrote:

So called Superior Grade Cryo
Work ok and test ok but in use and the tester there is low
insertion/extraction force in the sockets. Dragon's teeth hold them in
place ok, so will not fall out. Measuring the pin diameters about 2.15
mm compared to a random selection of others laying around of 2.3mm.
Known problem ? or leave alone or squash the pins a bit , perpendicular
to the base forks gap ? and colateral damage ?
These are from Peavey Deuce with final IC before the valves is corrupt
so possibility of intermittant valve action feeding spikes back into
the preamp ? no abnormal use admitted to , to have occassioned the IC
failure


Never had problems with Peavey sockets even on a VX VTR series that blew
one of the drivers. Replace with a pair of MJE13003 and the rest is
history.



--
Live Fast Die Young, Leave A Pretty Corpse



Not a socket problem but out of mechanical spec valve problem


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