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

[nospam4me@juno.com]

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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