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Philco 37-89 hot tubes

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Post by Ben Delk on Fri Jun 08, 2012 7:02 pm

http://www.nostalgiaair.org/Resources/226/M0013226.htm

I have a Philco 37-89 in the process of rebuilding. I have checked the tubes and replaced a few caps and resistors but still have few (caps\resistors) on order. The rectifier (5Y4) and output (6F6) are both running
very hot to the touch. Anyone have any thought on where the issue might be?
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Post by sprman on Fri Jun 08, 2012 7:37 pm

Hello they will run very hot ,normal. Tubes will run very hot to the touch. Recs and output tubes tend to run the hottest . Check the tubes if ok then they are fine, you can check both voltage and resistance on the pinns to the rec and output tubes if its ok you should be good to go.Allow plus/minus 20% on readings.Sprman

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Post by Ben Delk on Fri Jun 08, 2012 8:51 pm

Yeah hot is normal but these will bring a blister if you try to take one out as soon as you turn it off. I'll check the pine slot and hopefully the rest of capand resistor replacement will cool them down alittle....


Thanks for the info
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Post by sprman on Sat Jun 09, 2012 10:28 am

Hi yes they will blister you.A 6L6 will get very hot as will other recs.Sprman

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Post by Doug Burskey on Sat Jun 09, 2012 12:16 pm

Got burnt on my arm on a 5U4G rectifier,OUCH! did that hurt for a while! I have seen rectifier tube plates glow red hot bucause or a shorted electrolytic capacitor.

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Post by Bill Cahill on Sat Jun 09, 2012 5:54 pm

You should never plug something in un restored. You can do alot of dammage real fast. Like destoying the power transformer. Blowing up capacitors.. Etc.....
Be careful!
Bill Cahill


Last edited by Bill Cahill on Sun Jun 10, 2012 12:35 am; edited 1 time in total

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Post by Doug Burskey on Sat Jun 09, 2012 6:57 pm

Yeah I know.I got a call from a gentleman that was cleaning out he was clearing out his grandparents house,and wanted to know if I was interested in an old radio.I told him NOT to plug it in to see if it works.Of when I got there he had it turned on.I could see that red hot rectifier tube a mile away!

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Post by Ben Delk on Sun Jun 10, 2012 7:29 pm

I'm waiting on a 20k resistor and I'll be done with the chassis rebuild. Went to Radio Shack to see if by change they had one.....what a joke. I can remember a time if you needed electronic parts, RS had it. Now they are only interested in selling batteries and cell service.
So back to the 37-89........I replaced the electr. caps yesterday, put them back in the cans but here's the weird part. The schematic shows 2 separate caps, one 8 mfd, one 12 mfd. These had been changed out at some point because the caps were dated 1956, 1958 but they were both marked 80mfd and when I checked them they were over 90 mfd each. I understand you can bump up maybe 10%, but up to 80mfd.....what were they thinking. Any who, the 8 and 12 are working fine, nothing but the (5Y4) and (6F6) is running hot. Well that is except the 20k resistor that measure 14k and it is a bit warm. Update you when I move on to the next radio. Oh by the way, this radio cabinet has pin striping and man is that a pain.
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Post by Bill Cahill on Sun Jun 10, 2012 8:13 pm

Don't trust the originals. They will break down, and, cause major dammage.
The replacements must go, also.
A 10 mf, and, a 15 mf would be fine. The others are too high.
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Post by Ben Delk on Mon Jun 11, 2012 7:54 am

Correct you are sir, already replaced them.
Do you know a source that ships next day when order caps and such? It seems when I order parts it takes 7 or 8 days to get them. Heck I even expedited and order and it only cut one day off.
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Post by Bill Cahill on Mon Jun 11, 2012 11:15 am

Ben Delk wrote:Correct you are sir, already replaced them.
Do you know a source that ships next day when order caps and such? It seems when I order parts it takes 7 or 8 days to get them. Heck I even expedited and order and it only cut one day off.

Perhaps AES. Antique Electronic Supply companny.
More money, though.
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Post by Ben Delk on Mon Jun 11, 2012 11:20 am

I have tried them as well. A bit quicker but more money for sure. Thanks
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Post by Bill Cahill on Mon Jun 11, 2012 11:45 am

Hey, not to change the subject, but, look in raido forums section. I just posted on an old project. Speaking of buried nightmares!
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