motorola vt-71 HV capacitor trouble
 

This christmass I acquired a Motorola vt-71 that is in very good shape and dosent look to have much work done to it in its lifetime. Today I got out my parts list for the TV and ordered all of the caps from just radios but the 6KV caps were missing in the chassis and I have seen ones with five or six hv capacitors. So now I am confused as to what I need could someone with a clear print out of the schematic of a set on hand please tell me how many it uses?

the chassis is the ts-4j from Feb 25, 1949

Thanks

Have you looked at the ETF schematic archive yet?

http://www.earlytelevision.org/tv_sc..._diagrams.html

Phil Nelson

Here's a scan of the schematic from the original factory service manual.

By the way, my TS-4J was made on February 11th 1949. Just two weeks before yours.

The TS-4J (early) uses two 0.001 and four 0.005 all rated at 6,000 volts.
The TS-4J (late) uses two 0.001 and three 0.005 all rated at 6,000 volts.

You can determine which version you have by looking at the contrast control. The TS-4J(late) has two taps with three little caps around the control while the TS-4J(early) doesn't.

Could I trouble you guys for your chassis serial numbers ? Ill add them to my little database. Thanks.

TS-4 serial # 2425 ( ??? )
TS-4 serial # 5680 ( ??? )
TS-4D serial # 16368 (Mar 17, 1948)
TS-4D serial # 23149 (???, 1948)
TS-4D serial # 23723 ( ? 24, 1948)
TS-4D serial # 24969 ( ??? )
TS-4G serial # 42021 (Jun 24, 1948)
TS-4H serial # 43109 (Aug 4, 1948)
TS-4H serial # 45354 (Jul 26, 1948)
TS-4H serial # 48691 (Aug 13, 1948)
TS-4J serial # 52186 (Oct ??, 1948)
TS-4J serial # 57234 (Dec 17, 1948)
TS-4J serial # 61454 (Jan 5, 1949)
TS-4J serial # 67607 (Jan 10, 1949)
TS-4J serial # ??? (Feb 11, 1949)
TS-4J serial # 72008 (Feb 14, 1949)
TS-4J serial # ??? (Feb 25, 1949)
TS-4J serial # 84425 (Apr 12, 1949)
TS-4J serial # 86923 (Apr 23, 1949)
TS-4J serial # 87897 ( ??? )
TS-4J serial # ??? (May 13, 1949)
TS-4J serial # 98728 (??? 9, 1949)

Here you go, Bob.

TS-4J serial# 70500 (Feb 11, 1949)

Thanks it is the late chassis so I ordered correctly. When I get home I will get the serial number for you

Hi Bob
Here's the chassis#, serial# & production# of the units I have.

TS-18 serial # 333570 (Nov 11 1949)
TS-4J serial # 52575 (Oct 11 1948
TS-18? serial # 301795 (Jun 2 1949) No chassis stamping on unit, but it matches up to be a TS-18
TS-4J serial # 68262 (Jan 26 1949)
TS-4J serial # 66171 (Feb 4 1948)
TS-4D? serial # 5932/27E90129 (Jan?) This unit has channel 1. All I can read is Jan in the lower right corner in the back
TS-4J serial # 63638 (Dec 2 1948) I have just this chassis for parts.

I hope this helps you out. Have a great day!

Bob, all five of my VT-71 sets are in FL right now and I am in MD. I wiil "TRY" to remember to get the SN of each one for you. If I don't post it here by this time next week, pls send me a PM to remind me.

BTW FWIW, when ordering those caps, you may want to order extras since shipping is now high and I hate to run out. Bet you get another VT-71 eventually ;)

Bob,

I cant find a number in that sequesnce but my VT-71B-A, ch# TS-4G is dated June 25, 1948. :<)

Dave G

Thanks I'll add that info to my list. The serial # is usually stamped into the metal chassis below the grey metal box.

I was just curious how many chassis were made of each run and when. I'll summarize my findings in a future post.

http://farm5.staticflickr.com/4022/4...5aeb70da_z.jpg

I almost forgot about this
Mine is 72421 made on Feb 25, 1949 laste ts-j4 chassis.

Thanks!

Here's mine Bob
TS4J serial: 58966 Dec. 6 1948

BoB,

Blonde VT-71B-A, ch# TS-4G is dated June 25, 1948
The serial number shows 20430, but it looked out of sequence per your list:scratch2:

TS-4? 4703 no date, no FT, cad plated chassis
TS-4J 57280 Nov 10, 1948
TS-4J 65152 Jan 7, 1949
TS-4J 79677 Mar 22, 1949