Amp Supply switched to the all metal and rugged German Papst fan on the
ZC and later LK-800's. The one in my ZC has been run since new in 86.
Carl
KM1H
----- Original Message -----
From: "Charlie Young" <weeksmgr@hotmail.com>
To: <amps@contesting.com>
Sent: Monday, April 27, 2009 2:10 PM
Subject: [Amps] LK500 Question from New Subscriber
Hi Folks: I am a long time reader of the Amps archives, and finally
decided to subscribe. The amount of expertise available on this list is
phenomenal, and several of you have helped me over the years, either
with your postings here or by answering questions sent directly by me.
All of the help is appreciated. With retirement last year, there is now
time to pursue my interest in amplifiers.
Recently, I acquired a LK500ZB in an estate sale, and it exhibited the
tube socket heating/filament pin solder melting issue that has been
described on here. This one has a high/low speed switch factory
installed for the blower, and the problem was a cold solder joint on one
of the series dropping resistors, causing the cooling fan to run at a
very low speed all the time. I replaced the tube sockets, resoldered the
tube filament pins, and replaced the plate choke; the amp now runs fine,
and puts out ~1500 W when pushed (which I don't do when operating).
However, the fan in this amp is extremely noisy, to the point where it
is annoying to use.
Does anyone know what the CFM rating on this fan is supposed to be? It
is a NIDEC TORIN TA450 115V Model A30045-10. The fan is obsolete, and I
can find no data from the manufacturer online. I likely would replace
this fan if I could find another with adequate CFM and a lower noise
level.
Likewise, I have searched and can find no recommendation for how much
air should be directed across a 3-500 when using a transverse airflow
like the LK500 and SB220. I might have missed it, but did look for it.
Does anyone know wht this airflow requirement is in the application?
Currently, I am running the fan with a standard value dropping resistor
used by Amp Supply on their high speed position, and there is no way
that I am going to slow this fan down and reduce CFM to drop the noise
level.
Any suggestions or answers to my questions would be appreciated.
73, Chas N8RR
Likewise, I have not been able to find
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