[Boatanchors] Repair of B&W Tank Circuit

Tue, 27 Apr 2004 11:39:55 -0400

I just looked at the coil that I had repaired. I had forgotten exactly 
what I had done.
The plastic that supported the coil was bad and it would flop around. I 
had used some 1/8 inch lexan by about 1/2 inch wide and epoxied it 
inside the coil along the plastic strips that were there originally. I 
left the old plastic in place the separated the coil turns. Some of it 
was in bad shape but after the epoxy and the new pieces it is rock solid.

73
Gary  K4FMX

Gary Schafer wrote:
> I repaired one awhile back that had part of the plastic strips coming 
> loose. I used epoxy and a couple of new strips of lexan. Put the epoxy 
> on the coil and clamp a plastic strip on each side with some small C 
> clamps to hold the strips to the coil while the epoxy cures. Get the 
> epoxy between the turns some.
> 
> If some of the plastic is intact, don't disturb it. It will hold the 
> spacing of the coil while you work on one of the other strips. When that 
> one sets up the coil will be more stable and you can go to the next strip.
> 
> 73
> Gary  K4FMX
> 
> Mike Clarson wrote:
> 
>> Gentlemen: I have recently aquired a B&W LPA-1 "Widowmaker" linear
>> amplifier. No interlocks, plenty of exposed HV under the easy to open 
>> cover,
>> and, just for fun, exposed 120 volt terminals on the back of the power
>> supply. 4 866s powering 2 813s. The tank coil used to have plastic 
>> keeping
>> it rigid, however, this palstic has turned to some grey shards of some 
>> other
>> flakey substance. It is one of the standard B&W tank circuits with the
>> switch. Has anyone referbished one of these tanks and repaired the 
>> coil? I
>> am open to suggestions before attempting trial and error repair
>> mysef. --Mike, WV2ZOW
>>
>> _______________________________________________
>> Boatanchors mailing list
>> [email protected]
>> http://mailman.qth.net/mailman/listinfo/boatanchors
>> ** List Administrator - Duane Fischer, W8DBF/W9WZE **   ** For 
>> Assistance: [email protected] **         $$ For vintage radio info, 
>> see the HCI web site $$      http://www.w9wze.org   
>>
> 
> 
> 
> _______________________________________________
> Boatanchors mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/boatanchors
> ** List Administrator - Duane Fischer, W8DBF/W9WZE **   ** For 
> Assistance: [email protected] **         $$ For vintage radio info, see 
> the HCI web site $$      http://www.w9wze.org   
> 