[Hammarlund] Hammarlund Corporate Standard in 1930s
Katsuhiko Hirai
mxc04040 at nifty.ne.jp
Sat Nov 28 04:26:52 EST 2009
Dear list member,
I have found the Interface Design Compatibility between Super-Pro series.
First, I had the curiosity of the unit interface of SP series
by the posting of Ed W2EMN, 'Message: 4, Hammarlund Digest, Vol 70, Issue 8'
in the case of SP-200, as follows:
> > Starting from the right terminal on the receiver/power supply
> >
> > 1. 6.3 V ground
> > 2. 6.3V hot 7A est.
> > 3. chassis ground
> > 4. +140V screens 20ma est.
> > 5. +270V plate volt 60ma est.
> > 6. +385 output plate volt 50 ma est.
> > 7. -50V grid bias 10ma est
> > 8. AC switch
> > 9. AC switch
> > 10. not used
> >
It's almost same as the SP-10, initial product of the SP-series,
through URL: http://pub.ne.jp/bluemac/?entry_id=555726
Secondly, I checked the pin assignment of SP-400-X, through the manual.
Those specifications are same between SP-10, SP-200 and SP-400-X.
I assume that the SP-100 would be same as SP-10, though I could not confirm.
I noticed that Hammarlund had already completed the corporate standard
guideline to design the interface between separated units, in order to
provide the upward compatibility in the Super-Pro series even around 1930s.
It's really the great concept in engineering.
Best regards,
Katsuhiko Hirai/ JO1GEG
<mxc04040 at nifty.ne.jp>
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