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Can't Find U1732 Transistor
Can't Find U1732 Transistor
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Old 15th September 2019, 06:50 PM   #1
GKTAUDIO is offline GKTAUDIO  United States
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Default Can't Find U1732 Transistor

I'm working on a preamp that has a bunch of U1732 metal can transistors, and have been unable to find anything on the web about this part number. Below the U1732 number is 6808.
I'm assuming it's a FET based on the preamp construction and other parts.
Does anyone have a clue about this part?
Thank you.
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Old 15th September 2019, 07:11 PM   #2
Michael Jensen is offline Michael Jensen  Denmark
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Maybe you can use this link for info

Buy Now U1732 from Lintech IS09001:AS9120 Trusted Distributor
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Old 15th September 2019, 07:17 PM   #3
Mooly is offline Mooly  United Kingdom
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Can't Find U1732 Transistor
This might give you a trail to follow:

Quote:
TZ TOPAZ (MOSFET) SEMICON (Z/Suppressor)
U SILICONIX (FET) INTERSIL>HARRIS>INTERSIL (FET) VALVO>PHILIPS (FET)
U2TA UNITRODE (Ts)
from:
Identify Semiconductors by prefixes | Electronics Forum (Circuits, Projects and Microcontrollers)

And an old data book with U numbers but your's isn't listed:

siliconix :: dataBooks :: 1986 Siliconix FET Databook : Free Download, Borrow, and Streaming : Internet Archive
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Old 15th September 2019, 07:36 PM   #4
audiopro is online now audiopro  Canada
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Do you have a schematic. It might be possible to deduce a substitute
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Old 15th September 2019, 08:26 PM   #5
GKTAUDIO is offline GKTAUDIO  United States
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Michael - Thank you for finding that. Shortly after I posted my question, I found a link to the 5961 part number (not the cross reference page), from that same seller, but I'll have to get in touch with them to see if this is a direct replacement.

Mooly - thank you very much for those references. I will add these to my resources!

Audiopro - unfortunately, I've never found a schematic for this unit.

Thank you all,

Greg
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Old 19th September 2019, 09:32 PM   #6
GKTAUDIO is offline GKTAUDIO  United States
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Couldn't find any supplier with a data sheet, and nothing online either, but I did find a supplier with 14 originals in stock, which I bought. Thank you for your help.
Cheers,
Greg
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Old 19th September 2019, 09:38 PM   #7
JMFahey is offline JMFahey  Argentina
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Just curious, what´s the actual problem you´re trying to solve?
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Old 19th September 2019, 09:52 PM   #8
GKTAUDIO is offline GKTAUDIO  United States
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Thank you for asking. I've been trying to track down the cause of high DC offset in an old Audire preamp that is sufficient to trip protection in my amps. These U1732 transistors are not implicated at this time, but the matched dual FETs and one of the current limiting diodes appears to be bad, so I've bought replacements of those and am awaiting arrival of the diodes.

However, there are a bunch of these U1732s in this dual mono preamp, so I figured in for a penny, in for a pound; having bought the other replacements, I wanted some of these for future potential needs. Since I've not been able to find any data sheet, I didn't feel comfortable trying to substitute some other part. Seller had a minimum so I bought them all. It was a very expensive preamp in its day, my brother bought it new from the maker, and I'm trying to see if I can keep it alive as long as possible for sentimental reasons.

Need Your Assistance - Audire Andante

And some interesting history:
One of a Kind Audire Full Range Ribbon Speakers
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