JW

Cheaper T pad?
« on: January 11, 2021, 11:42:47 AM »
Is the Bourns 51 series 600 ohm T pad the only game in town? Imagine you were doing a 4 channel API with these. Like I am. That's around$100 just for that part. 1 T pad = more than the power transformer. Thanks Antek @$17.00

Anyway, anyone come across an alternative part? Or is it just too custom?

BTW, this part, the Bourns 51 T pad for the 1176 input I noticed went scratchy very quickly. I was like, cool I have a "vintage" 1176 now. Not. It's got new caps, I dunno. Maybe I should measure for DC on it or something. . . .

« Last Edit: January 11, 2021, 11:47:21 AM by JW »


shabtek

Re: Cheaper T pad?
« Reply #1 on: January 11, 2021, 11:45:44 AM »
One k log pot works in a pinch
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

Rob Flinn

Re: Cheaper T pad?
« Reply #2 on: January 11, 2021, 12:45:11 PM »
If you must have a t pad speak to brett at blore edwards.  He has cheaper ones.
regards Rob

abbey road d enfer

Re: Cheaper T pad?
« Reply #3 on: January 11, 2021, 01:02:53 PM »
Anyway, anyone come across an alternative part? Or is it just too custom?
the only notable feature ofa T-pad is that its input and output impedances are constant, so they can be inserted between lines that nned to be matched. It's a sequel of the POTS, where lines of several hundred miles had to be perfectly matched.
When audio equipment was designed by telephone engineers, the practice persisted, although only the side that connected to the world needed to match.
A long time ago matching was abandoned at the profit of bridging, where a low impedance source meets a higher (>10x) impedance receiver.
There is no objective reason for using a T-pad in a 1176, except vintage-correctness.
Shabtek's suggestion is wise.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

mjrippe

Re: Cheaper T pad?
« Reply #4 on: January 11, 2021, 03:00:03 PM »
I believe group member Avdo was making them for a reasonable price.

EmRR

Re: Cheaper T pad?
« Reply #5 on: January 11, 2021, 04:47:06 PM »
I don't know that any of them these days are a true T, none disconnect the shunt at full on so there's some loading still, but close enough for most things. 

Several other reports of going scratchy in 1176's, I think almost always shown to be DC on the pot, not a problem with the pot. 
« Last Edit: January 16, 2021, 09:20:08 PM by EmRR »
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Whoops

Re: Cheaper T pad? New
« Reply #6 on: January 16, 2021, 06:40:04 PM »
Is the Bourns 51 series 600 ohm T pad the only game in town?

Anyway, anyone come across an alternative part? Or is it just too custom?

No it's not "the only game in town", there's a nice alternative, it's on the White market here in the forum.
Cheers

http://www.avdaudio.com/catalog.htm?id=1372

« Last Edit: Today at 09:56:45 AM by Whoops »

JW

Re: Cheaper T pad?
« Reply #7 on: January 16, 2021, 09:12:13 PM »
Ah nice. Thanks for that!


 

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