Questions tagged [vintage]

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Identify Vintage Power Cord for Sears Electric Tray

I found this vintage Sears electric warming tray but it's missing a power cord. I tried a 2 prong figure 8 cord but the holes were too close together or too small to fit. Here are pictures of the tray,...
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2 votes
1 answer
93 views

Frequency marking on 1960s radio crystal

I found several of these old radio crystals, but they do not seem to have the frequency clearly marked, which I found unusual. Most other ones I have seen have a model number (e.g. CR-18/U) and the ...
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10 votes
3 answers
2k views

Is there a name for this vintage 3-pin connector configuration?

I am trying to find a suitable replacement for this connector for a vintage radio, but I'm not sure how to search for it or if they even sell them anymore. Simply "3 pin male connector" isn'...
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0 votes
2 answers
61 views

Feedthrough capacitor measured with an ohmmeter

I'm trying to fix a Motorola 8 track player model Quadraline TM912, and I came across this component which was new to me, the so called feedthrough capacitor. On the image above, if the fuse E6 is not ...
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19 votes
3 answers
1k views

Identify this type of diode from the 1970s (1.3V forward)?

I am currently reverse engineering the electronics of a Pentax Electro Spotmatic camera from the early 1970s. I have the circuit mostly figured out but now I want to find out more about the particular ...
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1 vote
0 answers
68 views

Is there a name for this 24-pin vintage Howard Jones connector?

Is there a name for this pin layout or style of 24-pin connector? This is a Howard Jones-style connector, circa 1950s I believe? I know similar ones are used for vintage radios, but the layout and how ...
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5 votes
2 answers
437 views

What is the name for this connector socket pin configuration?

Does anyone recognize this female socket pin layout as a standard design of any kind? I was looking at 5-pin CB Radio Microphone sockets, and they are similar, but not the same layout. Also, the ones ...
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3 votes
4 answers
486 views

How do I clean a badly corroded, jammed rotary switch with 12 position and 4 decks?

The 12-position 4-decked rotary switch on this Roland Re-201 dating back to the '70s or the '80s is completely stuck and won't move at all due to corrosion. The wafers on it's decks seem phenolic. The ...
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8 votes
1 answer
860 views

Restoring and operating a temperature gauge from the Soviet space shuttle Buran

After the Soviet Buran (БУРАН) program was suspended in the late 1980s, the Buran space shuttle was housed in a hangar at Baikonur. That hanger unfortunately collapsed due to structural failure in ...
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4 votes
1 answer
95 views

Replacing vintage 3 leg capacitor

So I have this old capacitor from a Sunbeam Mixmaster (model 9B). It has three legs, and no markings that I can use to determine its value. On the case is Ducon capacitor Pat. No pn441 250v AC MX197c ...
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  • 201
0 votes
2 answers
385 views

Flaxseed oil as insulating oil for wires

I've bought clothed wires which look like vintage wires found in old audio equipment. I was expecting they are 'oiled' or waxed but they visually didn't. Now I got flaxseed oil and olive oil available ...
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  • 93
0 votes
1 answer
86 views

Where to buy fancy/cool looking toggle switches [closed]

I wanted to know if anyone knows where to buy old, vintage style toggle switches like in the example photos. I have searched for toggle switches, and I have never found anything that looks remotely ...
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13 votes
2 answers
2k views

Can you help me identify this manufacturer's logo on this component

Stylized S logo that I cannot find any information on. The model of this stud mount diode is 240E10RTC. It measures 45 mm in width has 20 mm threaded end
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1 vote
1 answer
106 views

Macintosh Classic video input

I want to modify or rebuild the video amplifier circuit of the Macintosh Classic so that it accepts 8 bit grayscale input. Original circuit accepts 1 bit 5V P-P video signal. First idea was just to ...
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  • 477
2 votes
3 answers
218 views

Identify vintage capacitor

What is this component? Words on it say something like: DUIULER 0.1 ? +- 23% 250V 50~ WKG TL Where the "?" is a literal blob of ink that could be ...
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  • 618
1 vote
1 answer
98 views

Why do old ICs especially CPUs have golden caps and bottom lids?

What was the advantage of having a golden heat spreader and bottom lid ? Contacts make sense because of the electrical properties. This is still done today. But what were the effects of using gold ...
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0 votes
1 answer
62 views

Help me identify this connector please!

this is the only connection on a vintage turntable I came across. what is it?
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4 votes
1 answer
1k views

What is this obsolete (?) video screw connector called?

Found on the rear of an old (1970s) Sanyo monitor. It's not standard cable/co-ax, it's larger and beefier. It's used here for a composite signal. Thanks for any pointers.
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  • 1,093
5 votes
3 answers
918 views

Why am I seeing -5 V or lower on the output pins reading an Intel 1702A EPROM?

I am building a breadboard/Arduino reader to dump the data on a very old Intel 1702A EPROM chip. (data sheet) When doing some basic testing by tying all the address pins to ground, I am seeing ...
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  • 1,093
4 votes
2 answers
766 views

How to generate +5 V and -9 V voltages to read an Intel 1702A EPROM via Arduino?

I have some simple experience with TTL logic and Arduino, but I'm only a hobbyist and am bit stymied by my current project, which is attempting to read the data from an old Intel 1702A EPROM. The ...
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  • 1,093
-1 votes
2 answers
94 views

Identifying missing component from vintage synthesizer [closed]

I acquired a Hillwood C-1A synthesizer with a burnt circuit board with 3 empty holes where a part needs to go. I'd like to repair the board but I don't know what component to look for... Help? The ...
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10 votes
3 answers
2k views

What is this component? 1970s electronics

I broke it while trying to repair a nearby component on a 1970s board. It has two wires at one end that look like they are going to a coil and two axial wires. One of the axial wires came out with ...
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  • 293
0 votes
0 answers
91 views

Need help identifying antique porcelain fuse block

This is an antique 30 amp porcelain fuse block from a house, built before electricity, that was first wired around 1900. I would like to identify the manufacturer and the year of manufacture of this ...
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  • 117
0 votes
2 answers
35 views

Positive Grid current in valves

Vacuum tubes are much more idiotproof than transistors. Grid current does flow during a significant part of the drive cycle in some classes of amplifier operation. Many high power tubes have really ...
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0 votes
1 answer
88 views

I need help identifying a vintage battery

I found what looks like an old battery in the middle of nowhere. The plates are thick and soldered by hand. There is a matting between the plates like an AGM or maybe nickel iron battery. It's housed ...
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0 votes
1 answer
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Powering an old TI Silent 707 with a missing external AC/AC adapter

I just got my hands on a TI Silent 700 model 707, but it's missing the external power transformer. Unlike similar Silent 700 models, this features an optional battery pack which complicates things ...
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  • 111
2 votes
2 answers
337 views

What is a modern 2sd669 transistor replacement

I have an old Nad 302 integrated amp where one of the 2sd669 transistors is blown. I Cannot find any suggestion on modern replacements. To be honest I am a software engineer and analogue circuits is a ...
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-1 votes
4 answers
697 views

Snap in capacitor in place of through hole

I have an old Technics SU-V5 amplifier from 1980. It has through hole capacitors with very thin legs. All new capacitors are snap in and their legs are very thick. They won't fit in the PCB. How ...
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7 votes
3 answers
1k views

Can anyone help identify this mystery integrated circuit?

These were in a box belonging to my grandfather. I don't know if it's relevant, but he worked at a navy yard. I'm guessing they're around 50 years old. Nothing comes up on google search. I don't know ...
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2 votes
2 answers
160 views

Soft errors from SEUs/SETs in early 8-bit microprocessors?

Why is it that soft errors due to single-event upsets/transients never seemed to be a problem in early 8-bit microprocessors, like the MOS 6502 or the Zilog Z80? The microprocessors themselves were ...
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  • 111
2 votes
0 answers
89 views

'P.V.' marking on 1940's electrolytic capacitors

I am replacing the paper and wax capacitors in a tube radio of 1949 vintage. Puzzled by the initials P.V. where I'd expect to read VAC or VDC. Can anyone explain this puzzling jargon? For some reason ...
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4 votes
2 answers
391 views

Can this WWII era rheostat be modified to dim an LED bulb?

I have a WWII era RAF chart-board lamp in perfect unused condition. I want to use an LED bulb with the original dimmer as tungsten runs so hot. I want to avoid rewiring or bypassing the dimmer as the ...
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0 votes
2 answers
93 views

MRC Variac+ -- NEED HELP identifying this antique electronic

I gather, so far, that there is a variac component to this equipment. And that it was manufactured by the MRC Manufacturing Corporation (a Subsidiary of Materials Research Corporation), which once ...
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1 vote
1 answer
65 views

Need Clarification on Choke Placement (Vintage PS)

I came into possession of an old Electro D-612T variable DC power supply. Based on what I've read here and other places it was manufactured in the 1950s, and sold for a whopping $39.95 US at Radio ...
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1 vote
2 answers
297 views

How to create an ATX -5 volt rail for vintage Macintosh

I am trying to build a simple adapter for a mini ATX power supply for a vintage mac, I need a 5 volt rail that has it’s own separate ground (+5 volts to -5 volts) how would I go about doing this?
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0 votes
2 answers
166 views

Trimming a power supply to 0 V output in current limit

Here is another question on the originally Czech bench power supply that I recently built, but in the version¹ of it sold by various places (e.g. eBay) very cheaply. The circuit has two potentiometers ...
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2 votes
0 answers
61 views

Appreciate help in identifying this vintage IC - Fairchild HL41109 QB

Trying to find out what this one is has been a real head-scratcher. Google leads me down numerous rabbit-holes to dead ends. And I see 1 or 2 for sale on eBay, but apparently they have no idea what it ...
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2 votes
2 answers
187 views

How to find a Pin-to-Pin Replacement for TL-081, but with higher VCC? [closed]

After ordering and assembling one of those¹ "red" 0-30V/0-3A power supplies from eBay/AliExpress and taking a bit of a closer look at it, I'd like to replace the TL-081 op-amps. It's working ...
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  • 131
3 votes
2 answers
203 views

Converting old relaxation oscillator vacuum tube circuit to a more modern circuit?

I am trying to figure out how to convert an old relaxation oscillator circuit from the late 30's. The history of this circuit, is this is the buzz generator for the Bell Labs Voder, which is a speech ...
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2 votes
2 answers
169 views

Finding replacement PNP transistors

Hello and I apologise if my first question is rather basic as I am new to electronics. I have started to repair vintage amplifiers and have found transistors that I need to replace are no longer ...
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1 vote
1 answer
539 views

Can I replace a 101 ceramic capacitor with a close value one?

I'm kind of new to electronics and sorry if this is a bad question. I am trying to repair my father's old radio transmitter and I noticed that the PTT won't pick up your voice. I opened it up and ...
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1 vote
1 answer
164 views

What is this symbol on a schematic for an old milling machine?

On the schematic below, I'm having trouble identifying what the symbol drawn on top of motors 2 and 3 means. I've never seen anything like it. They're only present on the high-power spindle and feed ...
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  • 1,126
0 votes
0 answers
53 views

Intercepting signals from vintage computer (common ground)

I am trying to reverse engineer the signalling for a peripheral to an old 4-bit computer and eventually I want to emulate the peripheral and send the appropriate signals back to the computer. I know ...
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  • 101
0 votes
1 answer
104 views

Identify components in an audio circuit schematic

In the attached image you can see a circuit part of a commercial audio amplifier. I'm trying to determine what kind of component is R-CH and what role it plays in ...
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  • 37
0 votes
2 answers
244 views

Transistor substitution guidelines? (and the BC147A)

I'm in the US and fixing a vintage German integrated amp which has a crackle static issue I've isolated to a transistor in the preamp section. The transistor is specified in the schematic (below) as a ...
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  • 1,093
3 votes
2 answers
309 views

Difference between junction points in old schematic

What's the difference between the black circle and the white one in this old schematic? Of course the black ones are junctions, but are the white circles a pin, or an input of some kind? I'm trying to ...
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1 vote
1 answer
465 views

Replace amplifier IC with a class D amplifier (AN7133N with TPA3116 board)

Today I received this nice 90's Panasonic RX-CT900 boombox in the mail. The specs claims it is 2x60W PMPO (PMPO b**llsh*t throw-of- a-cliff specification) but in fact it is just 2x5.5W RMS (Panasonic ...
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  • 1,032
1 vote
1 answer
531 views

IPA becoming unobtainium, can I use denatured alcohol to clean vintage computers?

Due to COVID-19 and peoples' practice of hoarding, IPA is becoming incredibly difficult to find where I live (and online). Since we are all home so much these days, I like spending some of that time ...
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  • 1,170
1 vote
3 answers
436 views

Can you identify this diode? (vintage audio amplifier)

I am restoring a Japanese Teisco mixing amplifier from the 1970s. It's a solid state 5-channel mixer with 16ohm speaker outs and a line out. Amongst other problems, I have discovered a couple of the ...
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  • 175
1 vote
2 answers
82 views

ID a green ceramic component from a tachometer?

This component is from a 1960-70 vintage boat tachometer. It's about 1.25" long. It generates not a single reading on my 11-function multimeter (including capacitance). I may have fried it ...
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