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Old 7th October 2005, 06:19 AM   #1
rkc7 is offline rkc7  United States
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Default Bunch of old parts, worth anything?

My girlfriend's father gave me a box full of old parts that used to be his father's. His father used to build and work on radios and other electronics and I guess these were his parts. He said they're from like the 50s, I think.

There's a bunch of tubes, capacitors, a tube amp and some misc parts.

The tube amp has one tube, RCA 80, two big transformers, two huge capacitors, a big bar that looks like a resistor(?) and what appears to be the inputs/outputs. I have no idea how or if it works, I'm reluctant to just plug it in.

I'm wondering if any of this stuff is worth anything, or usable. I can test the capacitors and resistors, but have no idea how to test a tube or even tell if it is blown.

I really know nothing about tube electronics, that's why I'm here

He also gave me about 40 pounds of old radio textbooks, repair books and other old electronic books. Some of the books are from the 30s, up to the 60s, I think.

I can't get my card reader to work, I'll try posting some pictures tomorrow.

Here's a list of the things I can identify:
Tubes:
Hytron 35Z4 GT
Tung~sol H7N7 GT
Super Silvertone 27 (three)
6BK7 in metal sheath
6J6 in metal sheath
Silvertone 6AH4 GT
Silvertone 6AU6
KEN-RAD 305 GT/G
Something ends in 7Z, I think.
GE 6Q7 GT
RCA Cunningham Radiotron 56
Firestone Air Chief 12SA7 GT/G
6CB6
Silvertone 6CB6
RCA 1A7 GT/G
RCA 6SN7 GT
Sylvania 6CL8A
RCA 35Z5 GT
Sylvania 12SJ7
Sylvania 6SA7
RCA Cunningham Radiotron 45

Capacitors:
Aerovox 20-20 MFD 150 DCWV
Aerovox .02 MFD 600 DCWV
Mallory TP 418 .1 MFD 600VDC
Mallory TP 415 .05 MFD 600VDC (two)
Cornell Dubilier “Dwarf Tiger” DT-6P .1 MFD 600 V
CD “Dwarf Tiger” DT-45P paper condenser .5 MFD 400 V
CD Beaver BRL 4215 20/40 MFD 150 WV
CD Beaver Dry Etched Foil Electrolytic BR 252A 25 MFD 25 VDC
CD Cub .01 MFD 600 VDC
CD “Dwarf Tiger” DT-4S1 .01 MFD 400 V
CD “Dwarf Tiger” DT-6S2 .02 MFD 600 V
CD “Dwarf Tiger” paper condenser DT-6T25 .00025 MFD 600 V
CD ZB2F18 (no ratings)
CD ZB2J24 (no ratings, two)
Zenith 22 1158 .05 MFD 200 WVDC
Zenith 22-1126F .01 MFD 400 VDC
Zenith 22-830 .02 MFD 600 WVDC
Zenith 22-448F .004 MFD 600 V
Zenith 22-1220F .002 MFD 600 V

Resistors:
Some carbon composition resistors
Two Micamold resistors (one big, one small, didn’t test for resistance)
A few potentiometers
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Old 7th October 2005, 08:24 AM   #2
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Default Re: Bunch of old parts, worth anything?

Quote:
Originally posted by rkc7
The tube amp has one tube, RCA 80, two big transformers, two huge capacitors, a big bar that looks like a resistor(?) and what appears to be the inputs/outputs. I have no idea how or if it works, I'm reluctant to just plug it in.
The 80 is a rectifier tube. If there are no other tube sockets then it is a power supply and one of the tranformers is a choke.


Quote:
RCA 6SN7 GT
RCA Cunningham Radiotron 45
if there are 2 45s, these are the tubes for a really nice couple watt amp (assumming they test OK...

someone with greater knowledge (PRR?) will have to comment on most of the rest.

dave
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Old 7th October 2005, 11:20 AM   #3
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6CB6 is the "2N3904" of pentodes - very versatile
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Old 7th October 2005, 05:12 PM   #4
rkc7 is offline rkc7  United States
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Here are some pictures of what I have. I can take more, if it would help (just tell me what to take).

Oh the one I thought was "7Z" is a 14R7.

So is this "amp" a power supply? I just called it an amp because it looked like one. I really don't know anything about tube amplifiers or old electronics, so please excuse my ignorance.

I'm basically interested in how I can tell if these tubes are any good and if they (and the other parts) would be worth anything.

box of stuff
"Amplifier"
some transformers
Don't know what these are
All the capacitors
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Old 7th October 2005, 05:33 PM   #5
dhaen is offline dhaen  Europe
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The "amp" does look like a power supply of sorts. On the right is a mains transformer, the one on the left might be a choke. I don't know the intended purpose of the tappad resistor at front. The thing is home made on a 2nd hand chassis.

The "misc" things that you don't recognise are variable capacitors for radio tuning. the one on the left is for AM bands 530 to 1600KHz -ish, the one on the right is for AM but also has sections for FM bands 88 to 108 MHz -ish. Very limited use for audio. All I can think of is for adjustable Eq on a phono preamp.
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Old 7th October 2005, 05:49 PM   #6
djQUAN is offline djQUAN  Philippines
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I'd say the "amp" is a variable powersupply.

I also saw a selenium rectifier (well, I think it is.) in the box of stuff. it's the blue square thingy with a hole in the middle. sort if like a diode but much less current capacity.
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Old 7th October 2005, 06:02 PM   #7
rkc7 is offline rkc7  United States
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Quote:
Originally posted by dhaen
The "amp" does look like a power supply of sorts. On the right is a mains transformer, the one on the left might be a choke. I don't know the intended purpose of the tappad resistor at front. The thing is home made on a 2nd hand chassis.

The "misc" things that you don't recognise are variable capacitors for radio tuning. the one on the left is for AM bands 530 to 1600KHz -ish, the one on the right is for AM but also has sections for FM bands 88 to 108 MHz -ish. Very limited use for audio. All I can think of is for adjustable Eq on a phono preamp.
Yeah, it looked kinda simple to be an amp to me, but I didn't know. It was home made, my girlfriend's grandfather was a tinkerer and worked mainly with radios.

Quote:
Originally posted by djQUAN

I also saw a selenium rectifier (well, I think it is.) in the box of stuff. it's the blue square thingy with a hole in the middle. sort if like a diode but much less current capacity.
Yeah, that was another miscellaneous item in there.
Blue square thing
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Old 7th October 2005, 06:12 PM   #8
anatech is offline anatech  Canada
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Hi rkc7,
Can you take a shot of the books? Those I'm interested in. A picture of them stacked showing the spines, if they can be read that way.
-Chris
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Old 7th October 2005, 06:16 PM   #9
rkc7 is offline rkc7  United States
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Quote:
Originally posted by anatech
Hi rkc7,
Can you take a shot of the books? Those I'm interested in. A picture of them stacked showing the spines, if they can be read that way.
-Chris
I'll have to get back to you on that one. They're at my parent's house about 250 mi away. Next time I'm home, I'll bring them back with me and take some pics.
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Old 7th October 2005, 06:19 PM   #10
djQUAN is offline djQUAN  Philippines
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I have about three of those selenium rectifiers. about 1" by 1" square and has a current capacity of only 75mA from what I can remember. what's the size of that one?

in the "transformers" pic,

I think the top left looks like a choke, top right: audio output with the I core missing? bottom left: hairy choke. bottom right:coil from a relay or a bell ringer. what's the other side of that one?

well, if the top and bottom left both have only two wires, then they're both chokes.
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