Passive Components

Forum Can someone help identifying what this are? I reckon it is an old diod. Need something to replace it with

Join Passive Components to participate - click to join for free!

Actions

Forum Thread Details

State Verified Answer
Replies 63 replies
Subscribers 103 subscribers
Views 6857 views
Users 0 members are here

Related

Can someone help identifying what this are? I reckon it is an old diod. Need something to replace it with

kardan over 1 year ago

TUAC TD500-C1 mono amplifier

TUAC TD500-C1 amplifier board

The simple markings on photo does not have the Anode and Cathode marked.

Please reload the page as I have updated the last image.

Top Replies

geralds over 1 year ago in reply to Ian-Scott +3

Hi Ian-Scott Just I've rotated it for some readers. Best Regards Gerald ---
Ian-Scott over 1 year ago +2
Ian-Scott over 1 year ago in reply to kardan +2 verified

The diodes you have marked as 1n4148 next to .1k 250 either side of the op amp I'm sure should be 15v zenners ?

0 shabaz over 1 year ago

Also, you should show a photo of where it came from (and describe what the board is from). Such context is important to be sure the response is correct...

Also, it appears working does it not?
Cancel
Vote Up +1 Vote Down

Sign in to reply

Verify Answer

Cancel
0 kardan over 1 year ago in reply to $parentForumReply.Author.DisplayName

It seems to be brown, yellow, grey
Cancel
Vote Up +1 Vote Down

Sign in to reply

Verify Answer

Cancel
0 shabaz over 1 year ago in reply to $parentForumReply.Author.DisplayName

Could be.. I thought maybe the color code was brown-yellow-gray, 148, i.e. maybe 1N4148, but I've not seen that before.

Anyway, hopefully photo(s) can make it clearer, or some context.
Cancel
Vote Up +2 Vote Down

Sign in to reply

Verify Answer

Cancel
0 kardan over 1 year ago in reply to shabaz

Working, yes. But It does not reach the specification at all. Main caps and a few more small capacitors are now replaced. Only one, the 100uf capacitor was close to spec.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 shabaz over 1 year ago in reply to kardan

Are there not about 8 of them, all with the same color code? I can't tell from the photo too well, you'd have to look physically.

If there are, then you could temporarily swap a couple of them over (unlikely they are all fried) and see if it makes a difference If it does not, then that component is unlikely to be faulty.

Anyway, according to https://www.vintage-radio.net/forum/showthread.php?p=1595375 it might be a 1N4148 with one band missing or implied.
Cancel
Vote Up +1 Vote Down

Sign in to reply

Verify Answer

Cancel
0 kardan over 1 year ago in reply to shabaz

I I measured and 2 seem to be ok, one measures higher and the others don't work

Yes, there 8 light blue ones

I can not find one 1N4148 with 0.7v forward voltage
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Jan Cumps over 1 year ago

Is it a lab power supply?

This topology looks like the typical voltage reference + opamp setup. The core of a lot of supplies.

Also: the electrolytes seem to be Philips. They should be toast by now, as you realized.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 kardan over 1 year ago in reply to Jan Cumps

Seems to be 2 components missing from beginning, but there was sound anyway
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Jan Cumps over 1 year ago in reply to kardan

have you removed this one?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Jan Cumps over 1 year ago

For the helpers: Linking in the thread on UK Vintage Radio. There's more relevant info there

www.vintage-radio.net/.../showthread.php
Cancel
Vote Up +1 Vote Down

Sign in to reply

Verify Answer

Cancel