Each tube needs ±13CFM @ .082" water pressure so 2 tubes need 26CFM at the
same pressure. Try looking for an EBM Pabst centrifugal blower. They are
very quiet and small. I have a EBM G2E085-AA05 blower that would do the
job. Make me an offer after you have done your search.
Bob W6TR
----- 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 The fan is obsolete, and I can find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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