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Can anyone find the current rating of the 6.3V winding on transformer T402 (#120027) from a type 517 power supply ? T402 may actually be a dedicated 6.3V filament transformer since there were something like 106 six volt tubes in the 517. I don't have the thing in hand so I'm not sure.

There should be a prize if someone can answer this.

Thanks in advance.

Phil

Hi Phil,

Yes, that is a challenge. First, there were several 6.5 volt filament
windings on T402. Here is some of the info you need:

pins 17 & 18, 6.5 VAC, 12 A
pins 21 & 22, 6.5 VAC, 12 A
pins 5 & 6, 6.5 VAC, 4 A
pins 15 & 16, 6.5 VAC, 2 A

pins 19 & 20, 5.2 VAC, 2 A

The usual reason that there were so many separate filament windings on Tek
transformers that seemed to supply the same voltage is that these filament
windings were often elevated to different DC voltages to reduce the
heater-to-cathode potential difference in an effort to prevent internal tube
arc-overs. One winding may be elevated to +100 V DC and another to +225 V DC.

In researching this, I found out that I don't own a 517 or 517A manual. I do
have at least two sets of microfiche on the 517/517A but both sets are very
nearly unreadable (too small, too dark, and out of focus). But even if you
had perfect microfiche or a good manual, you would not find the current
ratings in either place since Tek never published transformer current ratings
in those places. There was an internal Tek document describing each Tek-made
transformer, including the pin-outs and current ratings. You have to know
someone who has a set of these very rare documents . . . Maybe this is
something we should add to our Tek web page, huh?

Stan
w7ni@...

PS I would be happy to accept a 517/517A manual as the prize ! !

Phil (VA3UX) wrote:

--- In TekScopes@y..., "Phil (VA3UX)" <phil@v...> wrote:

Can anyone find the current rating of the 6.3V winding on

transformer T402

(#120027) from a type 517 power supply ? T402 may actually be a

dedicated

6.3V filament transformer since there were something like 106 six

volt

tubes in the 517.

If all else fails, why don't you just add up the heater currents of
all the tubes fed by it?

Morris



l

At 11:32 PM 6/11/2001 +0000, morriso2002@... wrote:

--- In TekScopes@y..., "Phil (VA3UX)" <phil@v...> wrote:

Can anyone find the current rating of the 6.3V winding on

transformer T402

(#120027) from a type 517 power supply ? T402 may actually be a

dedicated

6.3V filament transformer since there were something like 106 six

volt

tubes in the 517.

If all else fails, why don't you just add up the heater currents of
all the tubes fed by it?

I would if I knew what the thing fed. I've asked the person who asked me for the same info (ie where is the transformer and what does it supply). I believe there is a separate fil transformer in the mainframe itself, along with at least one more stand-alone jobbie in the power supply itself. But I don't know which one he's asked about. I should find out soon.

Morris



l


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Can anyone find the current rating of the 6.3V winding on transformer
T402 (#120027) from a type 517 power supply ?

Sorry I can't help you with that, but if you have access to 517 power
supply parts, I think it contains a tube I'm looking for as well --
the Sorensen 2AS-15 "special diode". I also have use for one of the
time-delay relays may of the Tek supplies used, if anyone out there
cares to sell me one.

-- Thanks,
John Rehwinkel KG4L
spam@...

At 08:12 PM 6/11/2001 -0400, you wrote:

Can anyone find the current rating of the 6.3V winding on transformer
T402 (#120027) from a type 517 power supply ?

Sorry I can't help you with that, but if you have access to 517 power
supply parts, I think it contains a tube I'm looking for as well --
the Sorensen 2AS-15 "special diode". I also have use for one of the
time-delay relays may of the Tek supplies used, if anyone out there
cares to sell me one.

Sorry John but I don't have access to this thing. It's owned by someone several hundred miles from here. I think he intends to keep it and restore it. But I've asked him to let me know if he changes his mind.

Phil

-- Thanks,
John Rehwinkel KG4L
spam@...



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