#1
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Who made the best 6GH8A ?
Picked up some NOS for my RCA CTC-38, I have GE, RCA and Sylvania, all made in USA, wondering which will last the best.
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#2
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The GE's would be longest lasting, followed by the Sylvania's. The RCA's are OK, where the circuit isn't too hard on them, like AGC and sync.
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#3
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Used to buy Zenith branded ones by the gross for 19 cents.
They seemed to work as good as any but I dont know who made them. Radio Shack ones were junk. people would replace a few & we always came out & replaced them. When old they are fussy as to where they work. In other words they may work in AGC but no 3.58 osc. 73 Zeno |
#4
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Quote:
GE and Sylvania made most of the replacement, Zenith tubes. RadioShack tubes, seemed to be Japanese Raytheon's. |
#5
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My CTC-38 was only serviced by an RCA authorized dealer, and had all RCA tubes in it still. When I got it, the picture would come on for about 5 minutes, and then totally lose sync. I swapped the AGC and the Sync tubes, and the picture stays in sync but is a bit less sharp than before I swapped tubes.
I tested all the tubes and the bad one is a little bit weak, and has a white RCA logo versus the red one of the replacement tubes, so it is original to the set. I also replaced one of the 6GH8s in the colour section which had bad heater/cathode leakage with a used good Admiral tube I had laying around. My plan is to wait for a rainy day, pull the chassis, and replace all the electrolytic capacitors, plus the formerly Sync now AGC 6GH8A and the one in the colour section where I put in the used Admiral tube. Now that I have the Sams for the set (thank you, zeno!) I can see there's a decent list of capacitors needing replacement, but not too many. This TV actually lives in the living room, and is used as my primary TV for family entertainment - I posted a thread on it in the rectangular tube tv section a while back. It's really got a nice picture, aside from a slight waviness probably due to aged capacitors. Reliability is somewhat important, since it's my main TV set, but on the other hand I don't expect perfection out of a 46 year old TV... I also have a spare junk chassis for it, but no spare yoke or CRT. Interestingly all of the horizontal tubes - the horizontal output, the damper, the high voltage rectifier, are RCA replacements with a 1970 date code all marked "Japan", I didn't know RCA was sourcing tubes from Japan so early on! Last edited by maxhifi; 04-11-2014 at 11:26 AM. |
Audiokarma |
#6
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My CTC51K, all the OEM tubes are Japanese, but the 3A3. There was three tubes changed by the original owner. Two 6GH8's and a 11HM7.
Naturally, the 6GH8's were in the color circuit and were GE. The 11HM7, video output was a Sylvania. After I bought it, I had to repair the vertical circuit. It's a set, I referred to in an earlier thread. |
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