A Little Flat Tube Fun

[crtfool]

Yeah - I have been watching auctions on eBay for a while, but they get too expensive for a unit just to pull a tube out of. I really do not want a complete set anyway. I thought that if someone has an extra 1 lying around, we could work something out.

The first time I actually saw what the tube looks like was when you posted a picture earlier in this thread - very interesting and even cool looking design compared to most CRTs that I have seen - I do not know if this is so different because it was designed in another country, or if it has any technical benefits.

[jr_tech]

I suspect that the small magnetic deflected tubes actually offer better performance. But the "fat neck" to provide room for the deflection plates and the curved screen, which likely reduces deflection defocus make this tube very unique. Do you have a 913? I see them once in a while on eBay.

http://uv201.com/Tube_Pages/rca_913_crt.htm

jr

[amptramp]

Originally Posted by jr_tech

I suspect that the small magnetic deflected tubes actually offer better performance. But the "fat neck" to provide room for the deflection plates and the curved screen, which likely reduces deflection defocus make this tube very unique. Do you have a 913? I see them once in a while on eBay.

http://uv201.com/Tube_Pages/rca_913_crt.htm

jr

They were used on the RCA Type 151 oscilloscope. A picture of it, both outside and inside, is here:

http://www.myvintagetv.com/vintage_test_equipment.htm

along with the ad for it:

http://www.myvintagetv.com/oscillosc...ca_151_adv.jpg

I have two of these scopes.

[crtfool]

I have never seen 1 of these tubes - I am going to add it to my wish list!

[Carmine]

I found this on the same site under CRTs and Camera tubes. (Don't know how to link to the exact page, but here's the picture)



1964!

[jr_tech]

Cool find! This is a refinement of the Aken tube from the 50s... I believe that work continued through the mid 60s and even a color versions were attempted using various approaches.

jr

[jeyurkon]

For some reason I can't see the picture. But I can if I go directly to the link.

John

[Carmine]

Originally Posted by jeyurkon

For some reason I can't see the picture. But I can if I go directly to the link.

John

It disappeared from my browser too. I think some people get "funny" about having pictures on message boards etc. That's fine, but then at least design our site so it can be directly linked!

[jr_tech]

Test... Can we see these?

Added comment...Funny! now that I have downloaded and stored these pix, I can *again* see the pix in the original post, so I guess my browser stores them and supplies them as needed in the first post?

jr

[jeyurkon]

Originally Posted by jr_tech

Test... Can we see these?

They display fine.

John

[crtfool]

There should be a separate battery to operate the clock on the FD-3A.

[jr_tech]

Originally Posted by crtfool

There should be a separate battery to operate the clock on the FD-3A.

Yes! I just got the contacts cleaned up enough to get the clock working, but all that I can get the alarm to do is beep (fairly faint and high pitched). I don't see a mode for clock-radio (or TV) operation.

jr

[crtfool]

It's probably just a convenience clock - not meant for TV / Radio operation.

[jr_tech]

A fairly recent find. It is identical in layout and control functions to the Sony FD-40A, but differs slightly cosmetically. It is not "made in Japan", but is labeled:

Zenith Electronics Corp. Glenview Illinois 60025 U.S.A.
Assembled in Mexico

It is a decent performer, similar to the Sony-made products. Model # BT044S, assembled Nov. 1985.
jr

[AiboPet]

COOL!

Saw one of those on the ebay about a month ago....but it had a VERY odd "cone" shaped raster. I was a bit afraid of it because it was obviously a horizontal problem...but with the added festivities of working with that right angle geometry. It was small at the top and bigger at the bottom. My guess was it would have been an EXTREME simple width problem on a regular CRT....but was showing as a trapezoid.

There must be some really weird custom horizontal treatment in these.....like a trapezoidal raster custom to look square on these tubes. I have NEVER had to work on one of these beyond the usual little turning of pots. I think one of the pots in the 42A even messes with trimming this trapezoid geometry. My pink 42A was perfect...but I did open it and mess with it just for fun (It's of course back to normal again)