Heathkit IO-12

arcane secrets and handshakes revealed!

Heathkit IO-12

Postby Ty_Bower » Thu Oct 11, 2012 10:57 am

Is there any value in an old Heathkit IO-12 'scope? It does power on and makes a focused horizontal trace. I had no probes or signal source with me, so I couldn't test it any further. Price is $20... maybe the tubes inside are worth that much? It's such a charming old thing, I'd hate to just gut it. Maybe I shouldn't go back to the thrift shop tonight. Sigh.

Image
"It's a different experience; the noise occlusion, crisp, clear sound, and defined powerful bass. Strong bass does not corrupt the higher frequencies, giving a very different overall feel of the sound, one that is, in my opinion, quite unique."
User avatar
Ty_Bower
KT88
 
Posts: 1492
Joined: Wed Mar 21, 2007 2:50 pm
Location: Newark, DE

Postby Geek » Thu Oct 11, 2012 12:34 pm

Is the transformer good? (plug it in and no smoke and flames?) If it is, it can be used for audio. But expect to recap it at the very least.

If it were me, I'd buy it, pull the tubes, CRT and knobs (which can likely be ebayed for your money back + a coffee) and send the rest to recycling ;)

Cheers!
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
User avatar
Geek
KT88
 
Posts: 3580
Joined: Sun Oct 21, 2007 3:01 am
Location: Chilliwack, British Columbia

Postby EWBrown » Thu Oct 11, 2012 6:56 pm

For $20, it is well worth it. There are numerous useful tubes, pots, etc, and of course, the power tranny is good for modest-powered tube amp projects, I wouldn't use it for much more than a mono PP or stereo EL84 or 6V6 SE amp. It definitely would not be even close to sufficient for PP 6L6GCs or EL84s...

It is very likely that you will find that most of the tubes inside are Mullard or Telefunken, as these were considered as being "cheap imports" back in the 1960s.

The power trannie is approx 350-0-350 @ 60-70 mA, 6.3VAC @ 3-4 A and a 600-1200 VAC @ a few mA for the CRT HV, this includes a series-connected HV filament winding for the 1V2 (typically) HV rectifier tube. Just cut those leads short, and cap them off with heat-shrink tubing to prevent any unwanted HV arcing, minor corona discharge, etc.

I gutted out one of these same scopes a few years ago, the CRT worked, but had a burned-in dark trace across the face, and a couple of the PSU electrolytics were leaking out their contents =:o

I'd have to dig deep through the boxes in the cellar to find it, but I think I still have a manual for these scopes.

/ed B
User avatar
EWBrown
Insulator & Iron Magnate
 
Posts: 6389
Joined: Wed Mar 19, 2003 6:03 am
Location: Now located in Clay County, NC !

Postby Martin » Tue Oct 16, 2012 10:30 am

-If you don`t want to use and to restore the old scope, let it go to a person who like it.

To me it would be a shame to part out an old radio, amp or test gear.
But when I must read like that in all audio related communitys the day will come I part out my Marantz Tuner and build a horrible looking homebrew scope from the rest O:)

greetings
Martin
Martin
 
Posts: 7
Joined: Fri Sep 14, 2012 9:34 am


Return to test & measurement

Who is online

Users browsing this forum: No registered users and 1 guest