Welcome To the Hoffman Amplifiers Forum

September 06, 2025, 04:28:35 pm
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Poll

What do I do with all this test equipment

none
0 (0%)
none
1 (100%)

Total Members Voted: 1

Hoffman Amps Forum image Author Topic: I think I found a gold mine  (Read 9846 times)

0 Members and 1 Guest are viewing this topic.

Offline tcoil

  • Level 1
  • *
  • Posts: 27
Hoffman Amps Forum image
I think I found a gold mine
« on: August 11, 2011, 04:21:32 pm »
Hi fella's. I stumbled on to a Gold mine so to speak. I have a friend (Matt) that called me and said "I have a guy I work with that has some stuff you might be interested in. He wants to sell it". I Said "what kind of stuff?" He wasn't sure but  assured me I would be interested. Being the electrical novice that I am I drove about an hour and met Matt at the sellers house. First he shows me 3 radio cabinets from the 30's and 40's a little banged not bad for 70 yrs old. Then He pulls out all this stuff, boxes and boxes of test equipment (mostly heath kits from early to mid 70's). 2 ossicilliscopes, Hi-voltage supplies, a Box of pots mostly military grade, resistors, buttons, knobs, switches just all kind of stuff. By now I was drooling, "How much?" I asked?.He goes "How much you got"? I got $200 cash, I said. He said "can you fit it all in your van". I have a rec van with a bed in the back so I wasn't sure if I could, but I said I could anyway. So I loaded up the van and it was tight but I got it all in there. I couldn't wait to get home and got through all the cool vintage stuff I got. As I was about to leave he says "Oh yea hold on I forgot something. We went back into the garage and he pulls out a box of vintage tubes, mostly new in box 12ax7,au7,at7, 6l6, 6v6, 5y3,5ur4, el84, 7025, 6550, Mullard, RCA, Raytheon, Amperex. including s bunch of jan tubes. I had to pinch myself to make sure I wasn't dreaming. Here is a pic of some of the stuff. Being a novice I have no clue how or if I need any of this stuff to build and repair tube amps. So far I have been ok with a volt meter  and the ocassional help from the forum. Does anybody have any advise or knowledge regarding these three items. from left to right  -Heathkit's  electronic switcher  io-22, capacitor checker  it-28 and signal tracer it-12. I have 5 of the signal tracers.2 work 3 do not.

Thanks

Tcoil

Offline PRR

  • Level 5
  • *******
  • Posts: 17082
  • Maine USA
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #1 on: August 11, 2011, 09:08:16 pm »
The signal tracer and cap-checker have OBVIOUS use in gitar-amp tinkering.

> 2 work 3 do not

Should be easy to repair. If you don't need five sig-traces, I bet others here would give them a good home.

> "electronic switcher  io-22"

uh, Electronic Switch ID-22, right?

It adds dual-trace function to a single-trace oscilloscope.

Offline tcoil

  • Level 1
  • *
  • Posts: 27
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #2 on: August 11, 2011, 10:49:40 pm »
Cool, Your right it is the id-22. I'll keep the cap checker and signal tracer. Cool stuff for my lab. No clue how to use the cap checker..have to find a book.  I also have an impedence bridge (IB-28). again no clue. I have 2 cap  checkers. I don't think I'll need the switch. I'll put one of them up on the for sale board. Maybe someone is interested.

I can see how the tracer is going to make diagnosing repairs a little easier. 

Offline eleventeen

  • Level 4
  • *****
  • Posts: 2229
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #3 on: August 12, 2011, 01:18:45 am »
Sounds like you duplicated the "garage of doom" deal I did with an older fella about 12 blocks from me. The scope switch is....ehhh, kind of a source for 12AU7s.

I ultimately had to haul 8 Ford Explorer-loads worth of crap to achieve the result of emptying the garage of doom. I had to take lots of World War 2 vintage radios which I had little interest in. A day or two before I was going to haul them to the ewaste thingy, I had the idea of trying to find a radio museum, and I found the mother lode radio museum, http://radioblvd.com/ Turned out I had 4 or 5 of his top ten things and I traded them for a nice Gm Hickok 6000 tube tester and a nice hp power supply. He probably got the better end of the deal. but he also drove down from Reno Nevada to Lafayette, CA which saved me a lot of work. I gave him tons of parts which would never have been useful for me. He actually wrote up our deal as "the big trade" http://radioblvd.com/art13.htm (about 4 pages down) and got ALL of the radios I traded him working! Which truly amazed me because some were in quite rough shape. I was very happy to see the radio stuff go to someone who appreciated it.

I ended up selling lots of tubes and radios on ebay. I got maybe 2 dozen 6L6s out of the deal, unfortunately they were forties vintage "GA"s and "G"s and not all that much useful audio stuff. But I quintupled what I paid for the garage and it ended up well. Lucky it was only about 12 blocks away from my home.

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #4 on: August 12, 2011, 06:23:00 am »
tcoil , I have the same heatkit capacitor tester , the IT 28 . It is a great tester and very useful . I built it in '70. I have the user book and I can scan it and send to your e-mail adress

Offline tcoil

  • Level 1
  • *
  • Posts: 27
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #5 on: August 12, 2011, 09:03:37 am »
Lot of good vintage parts in the switch I might gut it and use the case for another project.

Wow, that would be so cool to have a manual for the checker. My email is Myopicvoid@comcast.net. I'll look forward to getting the manual. thanks     

Offline eleventeen

  • Level 4
  • *****
  • Posts: 2229
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #6 on: August 12, 2011, 10:00:43 am »
Heath IT-28 schematic available here....probably not the whole manual

http://www.vintage-radio.info/heathkit/

GREAT site for old Heath stuff.

Offline stingray_65

  • SMG
  • Level 3
  • *****
  • Posts: 926
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #7 on: August 12, 2011, 11:26:09 am »
LOL this is too wierd!

This morning I just picked up a Heathkit IT12 works great eye is bright and a Mullard 12AX& that tests 75% good on my Eico 666

A knight 620 VTVM

Eico 147 signal tracer

2 different RCA VTVM's one is high voltage and has a probe in a original box that looks new

Knight kg-650 RF signal generator

and what looks like 2 or 3 unassembled heathkit kits (Hybrid phone line patch?) (VTVM ef-1?)

And a box of old probes with old style microphone plugs
My mind is aglow with whirling, transient nodes of thought careening through a cosmic vapor of invention (H. Lamarr)

Offline tcoil

  • Level 1
  • *
  • Posts: 27
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #8 on: August 12, 2011, 09:11:52 pm »
Christmas in July

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #9 on: August 16, 2011, 06:01:23 pm »
tcoil ,sorry I did not receive your answer from the forum. Maybe one of my set up is not check for receiving e-mail ? I 'll scacnthe book tomorrow and I'll send to you.

About the answer from eleventeen , this is only the shematic of the IT-28

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #10 on: August 17, 2011, 05:52:16 am »
tcoil , look at that , a good information about heatkit capacitor testers.
I'll send you scan soon

http://www.angelfire.com/electronic/funwithtubes/Restore_cap.html

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #11 on: August 17, 2011, 08:16:06 am »
ticoil I just send you an e-mail but your adress doesn't work;  What is wrong ?

Adresse du destinataire : Myopicvoid@comcast.net
 Raison : Server rejected MAIL FROM address.
 Code de diagnostic : smtp;552 5.2.3 message size exceeds fixed maximum message size
 Système distant : dns;mx1.comcast.net (TCP|10.23.32.72|38272|76.96.62.116|25) (imta05.westchester.pa.mail.comcast.net comcast ESMTP server ready)

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #12 on: August 17, 2011, 09:05:14 am »
Quote
message size exceeds fixed maximum message size
Maybe your attachment exceeded a file size limit. Try sending a simple text only message before sending an attachment. If that works, then decrease the file size of your attachment.


A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #13 on: August 17, 2011, 09:27:14 am »
Thank Sluckey I'll try it late afternoon

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #14 on: August 17, 2011, 03:44:10 pm »
I should do a newer scan. This one a PDF and an can't separate it

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #15 on: August 17, 2011, 03:50:19 pm »
What's the file size? I use comcast.net and don't have trouble with huge attachments. I clean up my mail regularly though.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #16 on: August 18, 2011, 02:13:28 pm »
The file was 21.2 Meg. Very big.

But now I just send one page / one e-mail = 14 e-mail . Ticoil should have it.

Offline tcoil

  • Level 1
  • *
  • Posts: 27
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #17 on: August 22, 2011, 11:36:23 am »
Strattele, I got all the pages, thanks.  When  I send big files I got to yousendit.com.

Offline jjasilli

  • Level 5
  • *******
  • Posts: 6731
  • Took the power supply test. . . got a B+
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #18 on: August 22, 2011, 01:41:12 pm »
I too have gotten into vintage test equipment.  Needs rebuilds & distracts from amp building, but still a great experience.  I now have 4 Heathkit VTVM's monitoring plate & screen voltages while DVM's monitor bias, etc.  Some old meters need a friendly tap once in a while to read correctly.  Must be a '50's thing in homage to the Fonz! :wink: 

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #19 on: August 22, 2011, 03:46:50 pm »
Tank's for the adress of yousendit.com. But I never send big file often to pay for that.

Offline kagliostro

  • Level 5
  • *******
  • Posts: 7739
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #20 on: August 23, 2011, 03:09:29 am »
You can get a FREE account at MediaFire

http://www.mediafire.com/

there you can upload also big files and share the link for the download  :smiley:

Kagliostro
The world is a nice place if there is health and there are friends

stratele52

  • Guest
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #21 on: August 23, 2011, 03:59:20 am »
Thank's Kagliostro

Offline tcoil

  • Level 1
  • *
  • Posts: 27
Hoffman Amps Forum image
Re: I think I found a gold mine
« Reply #22 on: August 24, 2011, 01:52:40 pm »
Found  more box's. Heathkit ig 72 audio generator, a Capacitor sub box w/400v caps, resistor sub box w 1/2 watt carbon comp rsistors, 2 more signal tracers, an osciliscope (not working) (turns on but no line on crt), heathkit impedence bridge, 3 more vom's, tv alignment generator. And last but not least a tv degaussing tool. Whew! And there is anothers box or two. If anybody's interested in some of this stuff, drop a reply. I'm going to be putting stuff up on ebay. I'm tcoil on ebay same as here. 

 


Choose a link from the
Hoffman Amplifiers parts catalog
Mobile Device
Catalog Link
Yard Sale
Discontinued
Misc. Hardware
What's New Board Building
 Parts
Amp trim
Handles
Lamps
Diodes
Hoffman Turret
 Boards
Channel
Switching
Resistors Fender Eyelet
 Boards
Screws/Nuts
Washers
Jacks/Plugs
Connectors
Misc Eyelet
Boards
Tools
Capacitors Custom Boards
Tubes
Valves
Pots
Knobs
Fuses/Cords Chassis
Tube
Sockets
Switches Wire
Cable


Handy Links
Tube Amp Library
Tube Amp
Schematics library
Design a custom Eyelet or
Turret Board
DIY Layout Creator
File analyzer program
DIY Layout Creator
File library
Transformer Wiring
Diagrams
Hoffmanamps
Facebook page
Hoffman Amplifiers
Discount Program