[Amps] 3-500ZG brands

[R.Measures]

On Aug 12, 2004, at 7:45 AM, Clay W7CE wrote:

> Thanks to everyone for the quick replies to my question.  I will check 
> the
> tube, socket and soldering before concluding that the tube is bad.  I 
> looked
> at the solder connections on the sockets and they definitely look like 
> they
> could use resoldering.
>
> Pete, please describe the repair you made.  Was it to the socket or to 
> the
> tube pin itself?
>
> I need to acquire some silver solder for some antenna projects and it 
> sounds
> like it will be useful here as well.  Is silver solder readily 
> available or
> is it usually a special order?

Clay -  We sell 94% tin, 6%, 430ºF, 0.125" diameter silver-solder, 
solder (p/n 41.2) for 16¢ per inch.  Shipping is $1 per order.  The 
flux required depends on what one is soldering.  For soldering pins on 
3-500Zs, copper, or brass, use rosin flux, for soldering Ni-Cr or 
stainless-steel, use J/ W. Harris Sta-Brite acid flux.  For soldering 
aluminum , use J. W. Harris aluminum flux.

> Does it require a special flux?
>
> Thanks,
> Clay
>
> ----- Original Message -----
> From: "Pete Smith" <n4zr at contesting.com>
> To: "Clay W7CE" <w7ce at curtiss.net>; <amps at contesting.com>
> Sent: Thursday, August 12, 2004 3:46 AM
> Subject: Re: [Amps] 3-500ZG brands
>
>
>> At 10:04 PM 8/11/2004, Clay  W7CE wrote:
>>> I've just acquired a Kenwood TL-922A which needs a new pair of finals
> (one
>>> of the filaments doesn't light up).  Does anyone have experience 
>>> using
> the
>>> Taylor or RF Parts branded 3-500ZG tubes in this amp?  Does the 
>>> cathode
> bias
>>> need to be changed when switching to the 3-500ZG?  Any 
>>> recommendations
> will
>>> be appreciated.
>>
>>
>> Clay, before you do this, check to be sure that the filament hasn't 
>> simply
>> opened due to overheating of one of the filament pins.  This is a 
>> common
>> failure because the tube socket springs weaken with age and the 
>> resulting
>> resistance between the pin and the socket causes local heating.  I 
>> have
>> successfully repaired one that had gone this way with silver solder 
>> that
>> Rich Measures sold me (cheap), and have another awaiting the same
> treatment.
>>
>> 73, Pete N4ZR
>> The World HF Contest Station Database
>> was updated on August 2, 2004
>> 2753 contest stations at
>> www.pvrc.org/WCSD/WCSDsearch.htm
>>
>
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>
>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org