Tech-Master NIB TV Kit #5516

[wa2ise]

Get new caps instead of using the wax caps that came with it, also use new electrolytics too.

Be careful, it looks like a hot chassis set.

And be sure that the CRT you use has the same heater current as that of the heater string.

[dieseljeep]

Originally Posted by wa2ise

Get new caps instead of using the wax caps that came with it, also use new electrolytics too.

Be careful, it looks like a hot chassis set.

And be sure that the CRT you use has the same heater current as that of the heater string.

It's a low B+ hot chassis design, similar to the AC-DC Emerson set I just restored.
The CRT used would be a 17HP4, 20HP4 or a 21YP4. I would stick with the 17HP4 type, as the design is a slightly lower high voltage supply, intended for smaller screen sets.
I see it uses the tried and true synchro-guide horizontal circuit.
All the CRT's at the time were 600 ma, 6.3volt heaters.

[Crist Rigott]

Originally Posted by dieseljeep

It's a low B+ hot chassis design, similar to the AC-DC Emerson set I just restored.
The CRT used would be a 17HP4, 20HP4 or a 21YP4. I would stick with the 17HP4 type, as the design is a slightly lower high voltage supply, intended for smaller screen sets.
I see it uses the tried and true synchro-guide horizontal circuit.
All the CRT's at the time were 600 ma, 6.3volt heaters.

Yeah, I checked the specs and a 19QP4 is a 12K CRT. That would be a good one too...right?

[dieseljeep]

Originally Posted by Crist Rigott

Yeah, I checked the specs and a 19QP4 is a 12K CRT. That would be a good one too...right?

Isn't the 19QP4 a Dumont type round tube?
The number is not familiar to me and I've seen a lot of old TV's, but not real many Dumonts.
Unless you meant, 14QP4?

[Crist Rigott]

Originally Posted by dieseljeep

Isn't the 19QP4 a Dumont type round tube?
The number is not familiar to me and I've seen a lot of old TV's, but not real many Dumonts.
Unless you meant, 14QP4?

No, it is not a round tube.

[dieseljeep]

Originally Posted by Crist Rigott

No, it is not a round tube. I'm attaching the spec sheet for it.

I've never seen a set that used one and it goes back to 1953.
Unless, you already have one, I don't think that one would be that easy to source. It's hard enough getting the more common types for the old sets.
I jumped on the chance to get a NOS 14QP4 for my Emerson 1956 model AC/DC set. The original was a 14HP4, but I knew the Q was a perfect sub.

[Crist Rigott]

Here is a list of CRT's that I pretty sure will work. Of course there are others, I just haven't taken the time to do more research. I sent off an email to EFT because they list about 6 from 17" to 21" that will work. I'm guessing that a 19FP4 and a 19KP4 if there are such animals would work also.

17CGP4
17FP4
17GP4
17HP4
17LP4
19QP4
20FP4
20GP4
20HP4
20HP4C
20CP4
20MP4
21AFP4
21FP4
21KP4
21MP4

[Crist Rigott]

Originally Posted by wa2ise

Get new caps instead of using the wax caps that came with it, also use new electrolytics too.

Be careful, it looks like a hot chassis set.

And be sure that the CRT you use has the same heater current as that of the heater string.

Will do on all counts. Thanks