[AMPS] the three hold 4cx250 circuit, Alpha 77 and the SB-220 with a shorted tube.

[John/K4WJ]

Skipp,

The picture of the Alpha amplifier you have on the Amateur Radio Pages is 
not the same amp that manual is for. The manual is for the Alpha 77DX. The 
pictured amp is the Alpha model PA-77 Linear Power Amplifier. I have the 
same amp that is in the picture and it was made in Brooksville,  Florida 
and is not as hardy as the amp that the manual is for. This Alpha 77PA was 
the predecessor of the Alpha 77DX. In fact my "Instruction and Technical 
Manual" is dated November 1, 1972.

You might want to clarify this on the WEB page.

By the way I have a brochure for the Alpha 77DX and would be glad to scan 
it and send the file to you if you want.

73..de John/K4WJ

At 05:59 PM 1/7/00 -0800, nospam4me@juno.com wrote:

>Hello again,
>
>I received enough people asking for the three hole 4cx250 six
>meter amplifier circuit that I'll scan it into gif and pdf files for a
>down load package on the sonic server. Watch for it next
>Monday or Tuesday afternoon pst.
>
>http://sonic.ucdavis.edu     (Amateur Radio Pages).
>
>I previously posted the availability of the Alpha 77 Manual. It will
>remain on the server, but the file name will change (just shorter).
>If anyone has a picture of that amp they can Email me, I'll gladly
>place it on the description page.
>
>Time for a little humble pie...  While repairing a friends SB-220
>I mentioned in past posts here, I found one cathode to grid
>shorted tube.  In the process of powering the amplifier back
>up first time since the rework, I somehow replaced the bad
>tube back in the amplifier as a place holder and forgot about
>taking it out.
>The end result was the .82 ohm resistor blew up before my
>safety circuits kicked in. After a complete recheck and tube
>replacement, the amplifier now operates very well.
>
>So I lost a resistor, learned a lesson about marking bad tubes
>right away and wondered what I would have lost if the glitch
>goodies weren't installed.
>
>cheers
>skipp
>
>
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73..de John/K4WJ
*********************************************************** 
John/K4WJ in Pembroke Pines, FL
    QTH  26 00 51 N
         80 16 16 W

K8PXG from 18 Jun 59 to 11 Feb 97
K8WJ  from 12 Feb 97 to 07 Apr 97
ZF2HZ from 17 May 84 to 31 Dec 84
***********************************************************


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