Re: [Amps] AL-1500 fan speed switching

[Jim W7RY <w7ry@centurytel.net>]

The later AL-1500 had a simple piece of plastic tubing glued to the 
chassis.
73
Jim W7RY

On 11/7/2013 4:58 PM, Alek Petkovic wrote:
> The AL-1500 does come with a chimney. It is glass. Yours may have been 
> broken by a previous owner and never replaced.
> I bought my AL-1500 second hand and the guy shipped it with the tube 
> installed. Needless to say, it was a mess inside, when I got it and 
> opened it up. The chimney was busted, as were the grid fingerstock 
> contacts. The pins of the 8877 were all bent inwards at about 30 degrees.
> I had an Eimac 8877 socket and chimney and so I used the fingers, 
> spacers and teflon chimney. I successfully straightened the tube pins 
> and the amp is running nicely to this day. I recently replaced the 
> marginally rated hv filter caps.
> Your tips for soundproofing and wire size upgrade are very good. I 
> will try that with mine. While I have it open, I will perform W1QJ's 
> hv safety mod as well.
> 73, Alek
> VK6APK
>
> On 8/11/2013 8:24 AM, Réjean Léveillé wrote:
> > Hi Ricks
> >
> > If you looked the amplifier rear panel, there is a spare hole located 
> > below
> > the main power K2 relay. I installed a small SPDT switch between 
> > medium and
> > high speed. To extend the two brown wires each side of SPDT with the 
> > center
> > for purple, see your instruction manual. I also added some sound 
> > proofing
> > under the top cover and against both walls where is located the blower
> > motor. Do Not put sound proofing material over the tube.
> > Now what I could not understand why there is no chimney, I fabricated 
> > one
> > with high temperature orange color silicon rubber sold at aircraft part
> > supplier. The silicon sheet glued with high temperature silicon glue. 
> > Also I
> > sealed all 4 tube box corners with high density tape. Now almost 100% 
> > air
> > flow must get through the tube, this keeps the RF section cooler and 
> > also it
> > cut down the fan noise vibration. The chimney end is about 1'' below the
> > cover. In fact I always keep the fan speed to high speed.
> >
> > I bought it second hand with Eimac tube, it got less than 10 hours. 
> > The guy
> > was too afraid to use it. I did full mods for HV section, 24v PS, vacuum
> > relays, inrush current filament, double all wires size for HV input 
> > transfo
> > and secondary 5v, chimney, added capacitors for 160m, operation LED,
> > soft-key circuit. Now it looks closer to top end and commercial grade
> > amplifier. At 1.5kw only 15-20ma Ig key down.
> >
> > 73, Rejean va2am
> >
> > -----Message d'origine-----
> > De : Amps [mailto:amps-bounces@contesting.com] De la part de rick 
> > darwicki
> > Envoyé : November 6, 2013 9:47 PM
> > À : AMPS
> > Objet : [Amps] AL-1500 fan speed switching
> >
> > Anyone have a clever way to add speed switching to an Ameritron, I.E 
> > have it
> > run on low in STBY and med or high in OPR ?
> >   I'm thinking at least automatically from the STBY/OPR switch for 
> > Low/Med
> > with an option to kick it to High for RTTY contests.
> >   Taking 30 screws out of the case is not a good option.
> >   A three position switch on the back panel is probably easiest but 
> > would
> > require getting up out of my chair hi hi
> > Thanks
> >
> >
> > Rick, N6PE
> > =======================================
> > The only difference between a rut and a grave is the depth.
> >
> > Website:  http://www.qsl.net/n6pe/index.html
> >   eBay Store:  http://stores.ebay.com/N6PE-Radio-Tubes
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