I once repaired a Swedish copy of the 30L1. The discriminator was also great
when showing the amp not beeing linear or when there was a parasitic. Was
the indication not sensitive to harmonics if I remember right?
Hans S5KI
----------
>Från: "K0FF" <K0FF@ARRL.NET>
>Till: <amps@contesting.com>, <cqki8fh@juno.com>
>Ämne: Re: [AMPS] collins 30L - 1
>Datum: lör 30 sep 2000 23.23
>
>
>Dan, congratulations on aquiring the 30L1. It's a fine amp, and has some
>unique features. First of all, 700 Watts is right in the ballpark. Don't
>forget when this little gem came out, the rules read "1kW input" for hams/
>The 811A's with their 65 W plate dissipation are well matched to the PSU in
>the 30L1, altough lots of fellas retube them eventually with the 572B/T160L
>which of course has 160W plate dissipation. Net results are about the same,
>again limited by the power transformer. The two Collins amps, 30L-1 and
>30S-1, are the only units that I've ever seen with phase comparator tuning.
>The way I understand the theory is that when any amp is perfectly tuned, the
>input phase is in synch with the output phase. By monitoring this with a
>discriminator, you just tune untill the meter reads zero. That' s why the
>needle never goes to the full left pin, even when the unit is powered down.
>It would have been wasteful to provide a full zero center meter because the
>negative excursuion is small. Bottom line it is lightning fast to
>confidently tune it. Personally I can't speak as to it's ability to go on
>the Warc bands. When I used one, the were no Warc bands hihi.
>I've always found the 30L-1 to be a tame and clean amp, especially
>importantwhen used a buffer. The phrase "L" Network goes back to the old
>crew that used a 30L-1 as a buffer into a tube with handles. 70Watts is the
>normal drive level.
>
>Enjoy, Geo>K0FF
>
>
>>
>>I received a collins 30L-1. The ham who gave it to me said it had not
>>been on in over 20 years. I replaced several parts (cap, rest, etc)
>>including the 811A tubes. The key down on most of the bands is about 700
>>watts or less. I was wondering it the transformer might be bad. The D.C
>>volts is about 1800. Do any of you have and suggestions. I am driving
>>this amp with 100 watts from a Kenwood ts-820.
>>
>>Thanks
>>
>>Dan
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>
>
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