[Johnson] Viking Thunderbolt

[Steve H]

Im bringing an old Thunderbolt back to life and was told the padder caps in 
the output tank ought to be replaced, as per the former owners sugguestion.

Turns out there are (2) upper padders in parallel that are 500pF / 20KV and 
one lower one of the same rating in the tank circuit. I have some photos
plus a scan of the schematic here:

http://www.mediafire.com/folder/7plcwwj5onpvz/THUNDERBOLT

The (2) upper ones (C19, C20) measure near 400pF, the lower cap a little 
higher with my Sencore cap checker that will test at 600VDC.
Turns out I was able to get (3) old stock padder caps (Sprague 20DKT5) from 
a surplus warehouse online, however they are not much better
in capacitance, but an improvement closer to the total 1000pF needed in the 
original design at about 854pF total.

My question is that if I place one of the older original caps in parallel 
with the ones I just bought, will that effect the performance of the output 
tank
in an adverse way on some bands? From what I can tell the total capacitance 
there would be about 1236pF or so. The lower one right now is about 409pF.

I plan on using the amp mostly for xmitting on 80m and later on adding an 
external in line tank with the coax to support operating on 160m, but for 
now
I am focusing on 80m operation.

--
Steve Hearns
KA2PTE