Curt Nixon <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Absolutely--a fan can probably do more to prolong the life of any vacuum
tube device by years. I have small 12v fans in both my R-4A and T4X.
The downside is the noise but I grew up with an old Eldico linear on the
table--it used a pair of 4cx250s and used something akin to a home
furnace blower to keep them cool! It was so loud I had to quit using
VOX! :)
Curt
[EMAIL PROTECTED] wrote:
Curt,
Thanks for sharing the useful info. As to the heat, when I rebuild
the supplies, I always offer people a non-destructive fan upgrade to
prolong component life.
73,
Evan
-----Original Message-----
From: Curt Nixon <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Sent: Wed, 16 Apr 2008 8:44 am
Subject: Re: [drakelist] L-4PS hum
Curt Nixon <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> made an
utterance to the drakelist gang
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Hi Evan:
On the transformer buzz...the bolts are a way--sometimes they get
loose. Rather than the rtv tho..I guess I would look for an industrial
motor repair shop that rewinds big motors--they will more than likely
have a vacuum varnish tank for impregnating windings. They would
probably dip your transformer in the tank for next nothing (perhaps a
box of danish for the crew!).
THe varnish will secure any loose windings AND lamination voids that
can make noise. Place shrink tubing over the leads and shrink it. you
can cut it off afterwards so the leads are not too stiff.
I've also seen the case vibration resonance mentioned and the rubber
wedge can fix it if that is the problem--if it is, you can tell by
placing yopur hand on the case to kill the vibe. DOn't obstruct
airflow with large foam pieces tho.
FWIW
Curt
KU8L
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> made an utterance to the
drakelist gang >
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> Joe,
>
> I've rebuilt an number of L4B supplies and have found in several
cases of > hum, it was caused by a mechanical "resonence" if you will
between the outer case > and the transformer core. Reshaping the case
or putting stiff foam rubber > between the case and core can help.
While I've not done this on an L4PS, I have > cured hum on some other
transformers by flowing flowable RTV onto the > windings, from above,
let it cure, then from below. Sometimes it works, sometimes > not, but
only if a winding is loose. The flowable RTV is sold as windshield >
sealant for cars and is flowable where standard RTV is not. If a
lamination is > loose, then tightening the bolts might help.
>
> 73,
>
> Evan
>
>
> **************
> It's Tax Time! Get tips, forms and advice on AOL Money & > Finance.
> (http://money.aol.com/tax?NCID=aolcmp00300000002850)
>
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