Hi all - Baz, ZL1DD asked me to post the following :-
Bit pushed for time this morning so sorry if answer a
bit vague.
Just Google GS-35 and see what happens.
There are a number of guys selling and some sellers
give data.
Somewhere in cyberspace there is a great article on
conversion of
Drake L? amp from 3-500s to GS35. Also Lee
ZL2AL has a GS35 amp under
construction, I believe. If you follow this up please
keep us posted
as am seriously considering such a project myself.
Due to time
pressure I dropped off the 'amps' reflector, but
maybe Ken 1AIH would
be kind enough to post this query there. All
indications are that GS35
is a beaut tube, you can make socket yourself which
is a huge cost
saving. 73 Baz ZL1DD
Jeff King wrote:
>Barry,
>
>Very interesting.
>Have you any more internet information available on
>"3-500s die consider replacing with GS-35"
>
>I.e. What to do, source of tubes and sockets etc.
>
>Yours sincerely
>Jeff ZL4AI
>
>
>
>
>-----Original Message-----
>From: NZDXR-owner@mail.nzart.org.nz
>[mailto:NZDXR-owner@mail.nzart.org.nz] On Behalf Of Barry Kirkwood
>Sent: Wednesday, 3 May 2006 8:20 p.m. To: NZDXR@mail.nzart.org.nz
>Subject: Re: [NZDXR] SB220 fan noise
>
>Hi Graeme,
>Long time since I used an SB220, but would not advise slowing the
>fan. Cooling in the SB220 actually more efficient than in many other
>3 -500 amps, but you need all you can get. I would try loosening the
>fan on its mountings and fiddling with it, there may be some
>mechanical or acoustic resonance somewhere. Also look at resilient
>mounting of the fan. If the 3-500s die consider replacing with GS-35.
>Cheap and strong. 73 Baz ZL1DD
>
>Graeme Hunt wrote:
>
>
>
>>I've just replaced the fan in my linear with the latest from
>>Harbachs. Plan was to reduce the acoustic noise. Well the fan is
>>certainly cooling the amp very well but the noise is worse. Has
>>anybody tried reducing the fan speed on these amps , and if so what
>>size resistor did you use in the fan line. With 3-500Zs at US$275 a
>>pair, I thought maybe it's prudent to use your experiences rather
>>than experiment and melt them down.
>>
>>ZL1ANH
>>Graeme Hunt
>>ph 07 3491581
>>fax 07 3491681
>>email graemeh@iconz.co.nz
>>www.rotorua.net.nz
>>www.tour.net.nz
>>www.rozcraft.com
>>www.craftwarehouse.co.nz
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