Looks nice and it appears the unit is actually quite clean.
Looking forward to the 9815 porn. Better watch someone may be reading this.
Regards
Paul
WB8TSL
On Tue, Nov 8, 2016 at 8:08 PM, Adrian Godwin wrote:
> I'm pleased to report this TIC is now running again (albeit with some
> temporary hac
I'm pleased to report this TIC is now running again (albeit with some
temporary hacks, such as a 7915 regulator).
There were a couple of dried-out electrolytics, the shorted series-pass
regulator referred to above, and an open-circuit 2N708 controlling the
timebase gating. Another 2N708 died when
The real hack in the 5245 Nixie tube decoder is that the neon lamps were
the memory element.
hld
On 11/6/2016 2:15 PM, paul swed wrote:
Don't know what to say on the transistor. It may have been actually made
that way. They did lots of things back then. Yes familiar with the bcd
decoder its
A 2N1038 is in a TO-5 or TO-11 package.
A 2N1038-2 is a modified or selected part.
Is this transistor pressed into a hexagonal bushing that is about 1/2 "
long with a 10-32 threaded stud for mounting?
If so the bushing/heatsink is part of the transistor.
A google search for 2N1038 will show this
Yes, further searching reveals that although the 2n1038 is T05, the -2
version is X26 - mounted in a stud by the factory. So it could well be
glued. 2N1038s aren't unobtainable though, so I'll keep it original if I
can. Even though a 7915 would be fine !
I was a bit puzzled by the insulators. Very
iscussion of precise time and frequency measurement"
>
> Subject: [time-nuts] HP 5275A
>
> Slightly off-topic, as this is a general repair question. But it's a TIC.
>
> I'm repairing a 5275A timer (all-discreet count logic to 100MHz, neon bulb
> display, a mos
Just homemade opto-isolators. Used in choppers, too. The transistor was
indeed bonded to the heatsink. Just replace the whole thing with a
3-legged regulator? or simply a modern PNP t0-220 with a little heat
sink on it.
73, Don
On 2016-11-06 15:15, paul swed wrote:
Don't know what to say on
You could try heating the transistor and bushing then give the to5 a shot
of cold spray or supper duster hoping it will shrink enough to slide out.
On Sunday, 6 November 2016, Adrian Godwin wrote:
> Slightly off-topic, as this is a general repair question. But it's a TIC.
>
> I'm repairing a 527
Don't know what to say on the transistor. It may have been actually made
that way. They did lots of things back then. Yes familiar with the bcd
decoder its used in the 5245 class counters also. I think someone was doing
some funny stuff at lunch time to come up with that. It was the 60's after
all.
Slightly off-topic, as this is a general repair question. But it's a TIC.
I'm repairing a 5275A timer (all-discreet count logic to 100MHz, neon bulb
display, a most amazing bcd to decimal decoder made from neons and LDRs,
1-2-2-4 decade counters ..) and the current problem is a 2n1038-2 germanium
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