motorola vt-71 HV capacitor trouble

[bandersen]

Originally Posted by DavGoodlin

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

Hmm, the 'G' revision and date fit, but the serial# sure doesn't.

Originally Posted by Tim

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

Thanks. It's a drag that the 1st generation chassis don't seem to have a date anywhere.

[WISCOJIM]

Here are some more for your list Bob. Only one of the three had an easily visible date stamp. Is this the first "4F" set to show up?

4D 14025 Mar 10, 1948

4F 29295

4J 53608

[bandersen]

Thanks. Yes, it's the first 4F I've come across. Still no record of a B, C or E.

[ChrisW6ATV]

I think one of my two VT-71s may be a TS-4B; the other is a TS-4D I am pretty sure. Both have channel 1. I cannot easily get to their backs to check the versions and serial numbers, but I may be able to in the near future.

[teevee]

TS-4J 54402 Oct 6, can't make out the year..

[bandersen]

Originally Posted by ChrisW6ATV

I think one of my two VT-71s may be a TS-4B; the other is a TS-4D I am pretty sure. Both have channel 1. I cannot easily get to their backs to check the versions and serial numbers, but I may be able to in the near future.

It seems they didn't make very many TS-4B or TS-4C. Maybe a few thousand of each.

Originally Posted by teevee

TS-4J 54402 Oct 6, can't make out the year..

Thanks. It should be 1948.