Poor poor little National HRO Senior L76

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Poor poor little National HRO Senior L76

Radioroslyn
Phorum Expert

Posts: 7,301
Threads: 269
Joined: Dec 2009
City: Roslyn Pa

#70

01-31-2017, 03:20 AM

I finally got the digital readout to work properly on this beast. I started out using rectified heater voltage to power it but it didn't like it much at all. Worked much better w/a 9v battery.Ended up building a 12vdc p/s inside the rack p/s to power it. As Mondial said it is pretty sensitive so I had to attenuator the oscillator signal. Wasn't quite sure what is grounded on the counter but signal - power - and the mounting hardware had no interconnection. Grounding the power - to the chassis helped a lot and bypassing the 12vdc w/a .1 cap got it to settle down nicely. Works great now from 500kc-30mc. Haven't tried any of the low frequency coils yet.
I'm pleasantly surprised at how stable this old guy is after in little warm up time and the counter proves it.

Attached Files Image(s)

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry

(This post was last modified: 01-31-2017, 03:27 AM by Radioroslyn.)

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Poor poor little National HRO Senior L76 - by Radioroslyn - 04-13-2015, 09:08 PM

RE: Poor poor little National HRO Senior L76 - by morzh - 04-13-2015, 09:13 PM

RE: Poor poor little National HRO Senior L76 - by sam - 04-13-2015, 09:47 PM

RE: Poor poor little National HRO Senior L76 - by OldRestorer - 04-13-2015, 09:47 PM

RE: Poor poor little National HRO Senior L76 - by Arran - 04-13-2015, 09:49 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-13-2015, 10:25 PM

RE: Poor poor little National HRO Senior L76 - by Arran - 04-15-2015, 12:21 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-14-2015, 09:03 PM

RE: Poor poor little National HRO Senior L76 - by Eliot Ness - 04-15-2015, 12:39 AM

RE: Poor poor little National HRO Senior L76 - by sam - 04-14-2015, 11:31 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-15-2015, 07:57 AM

RE: Poor poor little National HRO Senior L76 - by Eliot Ness - 04-15-2015, 08:46 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-15-2015, 07:44 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-26-2015, 09:00 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-26-2015, 06:42 PM

RE: Poor poor little National HRO Senior L76 - by klondike98 - 04-26-2015, 07:26 PM

RE: Poor poor little National HRO Senior L76 - by Sean - 04-27-2015, 09:07 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-27-2015, 10:04 AM

RE: Poor poor little National HRO Senior L76 - by Sean - 04-27-2015, 05:30 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-29-2015, 10:04 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-29-2015, 10:07 PM

RE: Poor poor little National HRO Senior L76 - by Eliot Ness - 04-30-2015, 06:56 AM

RE: Poor poor little National HRO Senior L76 - by sam - 04-30-2015, 11:26 AM

RE: Poor poor little National HRO Senior L76 - by klondike98 - 04-30-2015, 04:00 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 04-30-2015, 06:55 PM

RE: Poor poor little National HRO Senior L76 - by Sean - 05-01-2015, 11:39 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-01-2015, 08:30 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-19-2015, 09:39 PM

RE: Poor poor little National HRO Senior L76 - by sam - 05-19-2015, 10:35 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-20-2015, 07:58 AM

RE: Poor poor little National HRO Senior L76 - by sam - 05-20-2015, 11:56 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-25-2015, 07:58 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-26-2015, 10:25 PM

RE: Poor poor little National HRO Senior L76 - by sam - 05-26-2015, 10:38 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-27-2015, 06:17 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-27-2015, 06:28 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 05-31-2015, 07:21 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 06-01-2015, 08:44 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 06-01-2015, 08:33 PM

OT RCA 6T71 1950 TV - by Radioroslyn - 06-13-2015, 10:19 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 06-18-2015, 09:13 PM

RE: Poor poor little National HRO Senior L76 - by sam - 06-19-2015, 04:27 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 06-19-2015, 10:11 PM

RE: Poor poor little National HRO Senior L76 - by Sean - 07-03-2015, 10:50 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 07-03-2015, 11:41 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 07-10-2015, 11:47 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 07-19-2015, 06:26 PM

RE: Poor poor little National HRO Senior L76 - by sam - 07-19-2015, 07:40 PM

RE: Poor poor little National HRO Senior L76 - by Paul Philco322 - 07-20-2015, 09:45 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 07-26-2015, 12:44 PM

RE: Poor poor little National HRO Senior L76 - by Sean - 07-26-2015, 06:22 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 07-27-2015, 05:05 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 07-31-2015, 06:38 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 08-03-2015, 12:42 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 08-19-2015, 07:17 AM

RE: Poor poor little National HRO Senior L76 - by Mondial - 08-20-2015, 12:14 AM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 08-20-2015, 07:49 AM

RE: Poor poor little National HRO Senior L76 - by Mondial - 08-20-2015, 12:34 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 08-20-2015, 06:53 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 08-20-2015, 10:34 PM

RE: Poor poor little National HRO Senior L76 - by sam - 08-20-2015, 10:37 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 08-23-2015, 01:02 PM

RE: Poor poor little National HRO Senior L76 - by sam - 08-23-2015, 01:42 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 08-23-2015, 01:57 PM

RE: Poor poor little National HRO Senior L76 - by sam - 08-23-2015, 02:45 PM

RE: Poor poor little National HRO Senior L76 - by vecher - 08-23-2015, 06:31 PM

RE: Poor poor little National HRO Senior L76 - by Sean - 08-24-2015, 09:36 AM

RE: Poor poor little National HRO Senior L76 - by targeteye - 06-11-2016, 12:45 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 06-11-2016, 07:20 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 01-31-2017, 03:20 AM

RE: Poor poor little National HRO Senior L76 - by OldRestorer - 01-31-2017, 09:36 AM

RE: Poor poor little National HRO Senior L76 - by morzh - 01-31-2017, 10:19 AM

RE: Poor poor little National HRO Senior L76 - by Mondial - 01-31-2017, 12:18 PM

RE: Poor poor little National HRO Senior L76 - by Radioroslyn - 01-31-2017, 01:02 PM

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