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FM-1 Re-build

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denny9167

FM-1 Re-build
« on: 27 Feb 2011, 10:32 pm »
Just received a Dynatuner FM-1 I bought off of Ebay,This unit is without the multiplex board,it has all the parts,plugged it in,noticed all the tubes light up except the EM84 tube,so I unplugged it,and opened the underside up,and WHAT A MESS!! pools of solder everywhere!!!,I knew I was in for the long haul here,PC-8 looks pretty good,PC-7!! it's a wonder this thing didn't blow up. After the first de-soldering,I knew this board was toast. I will post pics of progress, the discriminator IF  is a domed top,the rest are flat, I took my hex wrench and turned one of the cores and it turned just fine,so maybe the rest will be ok. I have it all disassembled,I will post progress.
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baldrick

Re: FM-1 Re-build
« Reply #1 on: 4 Mar 2011, 01:16 am »
Wanna trade faceplates and knobs for an FM-3 set?
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denny9167

Re: FM-1 Re-build
« Reply #2 on: 5 Mar 2011, 02:15 am »
Quote from: baldrick on  4 Mar 2011, 01:16 am
Wanna trade faceplates and knobs for an FM-3 set?

I might just do that!
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denny9167

Re: FM-1 Re-build
« Reply #3 on: 6 Mar 2011, 02:09 am »
Desoldering is complete I bet I removed I pint of solder all together,these old boards are beyond repair.



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bregez

Re: FM-1 Re-build
« Reply #4 on: 6 Mar 2011, 02:33 am »
What a mess.  I would go over the contacts with some desoldering braid or wick.  That should remove the remainder of the old solder.  Typically it is not a good idea to mix old solder with new.  Then wipe the bottom of the board with some naphtha or rubbing alcohol.
Good Luck.
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