[Amps] Alpha 77SX forward & reverse W not working

[Carl]

Yes the tank is the same and with the stock transformer there is not that 
much of a difference in output so the operation is adequate. There is 
nothing magic about the ARRL Q=12 and a wide variation is still tuneable.

Does even the stock DX harmonic suppression meet current FCC rules?  I doubt 
it but it appears to not bother anyone.

Carl


----- Original Message ----- 
From: "MU 4CX250B" <4cx250b at miamioh.edu>
To: <Gary at ka1j.com>
Cc: <amps at contesting.com>
Sent: Saturday, March 30, 2019 10:40 AM
Subject: Re: [Amps] Alpha 77SX forward & reverse W not working


> As I recall (and maybe I don’t!),the 77SX has the same tank circuit as
> the 77DX, which means the plate load Z is too low for the tank
> components. The amp tunes to resonance, except on 10m, but not certain
> how good the harmonic suppression is.
> Jim W8ZR
>
> Sent from my iPhone
>
>> On Mar 28, 2019, at 8:34 PM, Gary Smith <Gary at ka1j.com> wrote:
>>
>> Another hiccup in getting this old girl
>> back into shape. I rarely use the watt
>> meter in the amp, I use the one in the P3
>> and on top of the amp is a LP-100A, those
>> always handle my needs. As a general rule
>> I leave the multimeter in the Grid setting
>> and always use that.
>>
>> When I had a look see in the amp to see
>> what was what was going on with the
>> padding caps, all seemed to go well, no
>> unexpecteds happened but with reassembly I
>> tried using the watt meter and found it's
>> barely working; the meter moves but very
>> little. The last time I used it 4-5 months
>> ago, it worked well.
>>
>> No telling if I somehow bumped something
>> but is there a likely first thing to look
>> at? The meter movement is fine, works
>> seamlessly with grid current.
>>
>> 73,
>>
>> Gary
>> KA1J
>>
>> P.S. I received all the new  High Energy
>> 7.5KV 9A doorknobs to replace the old
>> Jennings and Centralab 1A variety. Waiting
>> for the Ameritron choke and some silver
>> plated flat wire to come in and I'll get
>> them installed. It'll be nice to have the
>> tank upgraded.
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