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Author Topic: Boat anchor "preselector"  (Read 1003 times)
KM1H
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Posts: 5513




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« Reply #15 on: August 11, 2019, 08:12:37 AM »

Done, Thanks
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G3RZP
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« Reply #16 on: August 11, 2019, 01:06:08 PM »

Have you got the reply?
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WB4SPT
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Posts: 782




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« Reply #17 on: August 26, 2019, 12:24:34 PM »

During Cycle 19 my first factory radio was a used SX-25 that was a complete POS on 15, actually the the whole band 4.
I had my dad return that since he insisted it had to be good if it was a Hallicrapers, and used MY money with no further parental interference bought a late version used HQ-129X. With a lot of listening to my HS Science/Math teacher, Brother Patrick Dowd, W2GK (SK in 2014 and famous among vacuum tube historians) I started with some tube swaps and it became excellent on 15 and 10 M and I wound up with over 90 DXCC as a Novice. The school club station, W2ZLK, had a HQ-129X so I was already hooked before the SX-25.

Dad could barely wire a socket, he was a textile salesman in NYC, but went ahead soon after and bought his first TV, a Halli POS of course. After several (many) service calls he had the store take it back and splurged on a Dumont floor console model. It never burped and was replaced by a Zenith SS color set in the 70's which was still working after he died and mom brought it with her when she moved in with us in 1998 and passed in 2002 at 93. It still works using a converter box for digital and is in my BR as a reminder !!

With a pair of good 58's and 57 mixer or later 6C6/6D6's in the front end the early HRO is still passable on the A coil, mine is from the second run in 1935 with the 2.5V tubes. Without all the losses of a typical haywired band switch they sure enjoyed a long life ending in 1968 with the final HRO-60 run. I have one of those also Shocked

Carl

cool story;   but, make sure that Zenith had the updated 4 wire horiz sweep cap.   I saw many a zeniths with failed caps and in theory, a high X ray generator.   I did a call on one that had developed so much anode voltage that it damage the front glass, with a hole, apparently the electron beam had that much energy.  The CRT lost its vacuum even.   Another one, generated a crack in the neck, from second anode to the yoke.   I don't know how much HV was generated, but seems to me over 100kV....
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KM1H
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« Reply #18 on: August 27, 2019, 08:48:28 AM »

Quote
Have you got the reply?

I thought I replied to the email?

If not thanks Peter.
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KM1H
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Posts: 5513




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« Reply #19 on: August 27, 2019, 08:53:22 AM »

Quote
I saw many a zeniths with failed caps and in theory, a high X ray generator.   I did a call on one that had developed so much anode voltage that it damage the front glass, with a hole, apparently the electron beam had that much energy.  The CRT lost its vacuum even.   Another one, generated a crack in the neck, from second anode to the yoke.   I don't know how much HV was generated, but seems to me over 100kV....

OUCH!

I havent turned this one on in awhile, maybe it should face a mirror
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K5WLR
Member

Posts: 313




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« Reply #20 on: August 27, 2019, 10:45:07 AM »

Quote
I saw many a zeniths with failed caps and in theory, a high X ray generator.   I did a call on one that had developed so much anode voltage that it damage the front glass, with a hole, apparently the electron beam had that much energy.  The CRT lost its vacuum even.   Another one, generated a crack in the neck, from second anode to the yoke.   I don't know how much HV was generated, but seems to me over 100kV....

OUCH!

I havent turned this one on in awhile, maybe it should face a mirror

I used to work for a Zenith TV retailer. The bad 4 lead capacitor was white. The replacement was orange. We were told to replace every last one of those we found out in the field which Zenith paid for. I always made sure I had an ample supply of the replacement capacitors on the service truck every morning before leaving the store. Nasty little booger that one was!  Shocked

Hope this helps you determine if your set has been updated. I really think that by now the old capacitors would have blown up. They were quite unstable and this was 40+ years ago! However, please check it!

73
Will Rogers
K5WLR
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