I'm about to do the same thing with an Alpha 86. I thought it may be a good
idea to remove the tubes until the caps have proven good then re-perform the
exercise with the tubes in place.
Bill - WE5P
>
> On Dec 11, 2018 at 23:42, <Stan Gammons> wrote:
>
>
> I would set the meter to grid current and use a variac to first power it up.
> Unless you have a 240 volt AC variac, you may have to rewire the power supply
> and RF deck for a 110 volts AC variac. There might be a loud bang if one
> plugs the amp in and just turns it on. Tubes could be gassy from setting so
> long and arc over when full plate voltage is applied. Harbach makes a
> replacement power supply board for the L-4B and the L-7. I think that board
> is what I have in my L-4B power supply. Good luck with the amp. The L-4B is a
> nice old American made amp. 73 Stan KM4HQE On 12/10/18 4:53 PM, Ray LaRue
> wrote: > The local club here has inherited a very nice L4B amplifier that
> we > suspect hasn't been run in about 10 years or more. On a scale of 1 to
> > 10 with 10 being new, this is a very nice 9. I have been asked to >
> reform or replace the filter caps and bring it up on line. > > As I've
> never worked on an L4B, I would appreciate any experienced > tips or
> no-nos, as !
I begin t
o dive into it. > > Any assistance would be appreciated. > 73, > Ray,
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