[Amps] Heath SB1000 no power out on 10 and 15

[Jim W7RY]

Short out the contacts with a piece of wire and try it again.

That will tell you if the band switch is bad.

What is the input SWR on the bands that don’t work?

73
Jim W7RY


-----Original Message----- 
From: amps at n3kf.org
Sent: Wednesday, October 28, 2015 2:39 PM
To: amps at contesting.com
Subject: Re: [Amps] Heath SB1000 no power out on 10 and 15

So how does one know if the band switch is good or bad for RF? My band 
switch obviously had some burning. No contacts are missing. But the switch 
plate is definitely etched. I cleaned it with some alcohol, and got lots of 
dirt off of it. I have not reassembled yet to see if that changed anything. 
The ceramic wafers have no carbon tracking. But like I said the metal plate 
definitely looks to be etched. Guess I need to try it after the cleaning. Is 
there a decent contact cleaner I can use to really clean the switch up that 
is not detrimental to RF?

-- Ken. N3KF

Sent from my Android tablet



-----Original Message-----
From: amps at n3kf.org
To: amps at contesting.com
Sent: Tue, 27 Oct 2015 8:50 AM
Subject: [Amps] Heath SB1000 no power out on 10 and 15

Hope this is not a repeat from me. I have an SB1000 (AL80A clone) I built 
back in the 80s. Lots older and with back issues it is hard to get around 
and work on now. I have the original and a new tube and the amp acts the 
same. On 160 through 20 meters all seems to be OK. However, on 10 and 15 
meters there is no output. The oddity is that the meters show plate and grid 
current just like normal and the tube heats up. I figured this is an easy 
one and I smoked the band switch. Other then some carbon tracking, the 
switch looks good. Cleaned it up some, but no change (really did not expect 
it since the output does not exists). The PO meter of the amp does not show 
any power on any band. Another problem, but I think I have read about this 
one.  So is the no power out a common problem? If not, I guess I got to dig 
into it. When I said I get grid and plate current, that is with low power 
since obviously if this is not putting power out, that RF must be 
dissipating somewhere! Thanks f
or any thoughts.

-- Ken N3KF

Sent from my Android tablet
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