Kapanadze Cousin - DALLY FREE ENERGY

[poynt99]

Fortunately, there is a cross-reference for old HP parts, which has come in handy for me:
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv010.cgi?read=27258
and here:
http://www.paulswan.me/arcade/datasheets/HP-xref.pdf

Here are some Tek cross references and parts for sale:
http://www.sphere.bc.ca/test/tekequiv.html

Motorola does the same with their radio equipment.

[itsu]

@Itsu

Unfortunately I cannot verify these slopes, because I can't see your scope's vertical & horizontal scales.

It is also entirely possible that these traces are curving up because of switching characteristics of the BJT, instead of the magnetic saturation effect. 
You can disprove this terrifying hypothesis by temporarily shorting out the winding/inductor.  When you do this, the current pulse should become rectangular, if the BJT is switching quickly enough.

Ok, two pictures close up, the second one is with winding/inductor shorted out.


Hoppy, I checked my blue toroid, and partially scraped of the blue paint, its black/grey underneat

Regards Itsu

[verpies]

Ok, two pictures close up, the second one is with winding/inductor shorted out.

And just to be sure:
1) What was the value of the CSR across which these scopeshots were taken?
2) What was the supply voltage to the CSR & W1, when these scopeshots were taken?

1Ω an 40V ?

[itsu]

And just to be sure:
1) What was the value of the CSR across which these scopeshots were taken?
2) What was the supply voltage to the CSR & W1, when these scopeshots were taken?

1Ω an 40V ?

1 ohm and 70V, with 40V we just are at the starting point of the bend in the trace.

Regards itsu

[Hoppy]

Ok, two pictures close up, the second one is with winding/inductor shorted out.


Hoppy, I checked my blue toroid, and partially scraped of the blue paint, its black/grey underneat

Regards Itsu

Itsu,

The colouring is a surface resin coating for colour coding purposes. The actual ferrite underneath will always be black/grey.

Regards
Hoppy