[Collins] 30L-1 TUNED INPUT PROBLEM

[kwylow zinjanthropus]

Just wanted to know if this is typical for this type of amp. After all, when you're pushing 10-15 meters, do most amps start to derate at those frequencies? Just wanted to know and thanks. Cal. N6KYR. 
 Jim Bull <ke3nk@erols.com> wrote:Greetings 

Have questions--Looking for Advice.

In rebuilding a late Winged Emblem 30L-1, I've encountered a problem on
the Tuned Input for 15M and 10M.

75/40/20 are all 100%. 600(plus) Watts output into my dummy load with a
Bird 43 (reading reflected) between the exciter and amplifier. On those
three bands, there is typically 2 watts or less reflected.

On 15 and 10 meters, I can tuned close to 500W watts but the reflected
is pushing 10 watts (or more) depending on which portion of the band I
test.

I've checked L-14 and L-15 including cleaning carbon residue from the
internals. Replaced C-68 & C69 as well as C-75 & C-76 Mica caps.
(changed these just because I was stumped). Doubled checked to make
sure that 30L-1 Service Letter #1008 was incorporated (it was), so, now
looking for advice.

ANY advice/assistance will be greatly appreciated.

Jim Bull/Ke3nK

Sponsored by the Collins Radio Association
http://www.collinsra.com


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