[Milsurplus] MBF Navy VHF set breakthrough

[Al Klase]

Rob,

ANY paper cap of the WWII era is highly suspect.  If you want something 
to work reliably, and not bust your brain the the troubleshooting phase, 
replace all the damn caps first!

Al

On 5/7/2012 11:37 AM, Rob Flory wrote:
> Determined to get this thing off my bench, I decided to take another look
> today.  I have been focused on getting the driver circuits tuned up, as I
> was not getting rated transmitter power output.   Originally designed for
> 60-80Mc, the RF inductors needed remaking with additional L to get me onto
> 50Mc.  I was stuck thinking that poor Q was dragging me down.   I took a
> look at the screen voltage on the 28D7 RF PA tube and read 3 Volts.  I
> couldn't find any tube specs in any of my reference books, but didn't need
> them to know that was dead low.  The sangamo bypass cap read 350 ohms.  I
> wonder if this type is like the micamolds, a paper cap in mica cap clothing.
>
> Bang, now I'm getting a couple watts output, good to go.
>
> This set is to talk to the TBS at BB-59.
>
> RF
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/