One more front.


Potato Cakes

So I had an interesting thing happen. Or perhaps unexpected would be more accurate. One of my 176 builds I used to do a record. Then when I received my matched 6BC8 tubes from Bowie, I did more testing, but then at some point of listening back through it, the input gain dropped. I messed around in the back of the rack and apparently the In+ connection was intermittent the whole time, so I fixed that but then I still had about a 10dB difference to the other unit. What it came down to is that the O-1 went bad, something I'm not sure how it happened since it had been working great this whole time. I have had transformers be faulty when purchased new, but never seen one go bad over time. Fortunately I have a pair of O-2 that I thought about selling but never did and after installing it everything is back to normal. Very strange but glad it was a fairly easy fix.

Thanks!

Paul

Potato Cakes

Here's both units up and running testing with some program material. I can't tell a difference with the controls set the same.

Thanks!

Paul

Phrazemaster

Hey Paul - great job in figuring that out! Thanks for sharing.

Mike
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Phrazemaster

This thread is starting to sound like an echo chamber...isn't anyone else building or gathering parts?

I was also wondering what folks are using for C3 and C4. In Martin's pix it looks like he used tall electrolytic-looking caps, but there is no side shot so I can't tell. The only film caps I can find that might be appropriate are some orange drops (which I've seen used on originals). But they don't match what Martin used.

So what did you guys who already built use for C3 and C4?

Thanks,

Mike
So....anyone want to share what capacitor you used for C3 and C4? Looks like electrolytic...
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Potato Cakes

It was posted somewhere in this thread that those are or can be film capacitors. I am using some axial Vishay film caps vertically mounted with some shrink tuning over the exposed lead. Seems to work great.

Thanks!

Paul

Phrazemaster

Thank you Paul. I sourced some orange drops but I think they would look funny there.

Anyone know what the originals used?

Martin, what did you use for C3 and C4?

Thx everyone,

Mike
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rainton

Thank you Paul. I sourced some orange drops but I think they would look funny there.

Anyone know what the originals used?

Martin, what did you use for C3 and C4?

Thx everyone,

Mike

Mike,
as far as I know the vintage units used either Aerovox AUTOPASS radial film caps or CHICAGO PERM-A-CAP radial film caps.

I sourced both but all wer leaking and I couldn't use them.
In the end I bought Wima radial film caps - and stuffed them into the bakelite enclosure of the CHICAGO PERM-A-CAPs  ;D

Looks authentic and works great.

But I've even seen refurbished units with orange drops - looks funky  8)

Phrazemaster

A-ha!

Very clever of you Martin!

Thanks a lot for the detailed info; I really appreciate it!! I’ll see what I can do....

In other news, I received the switch/pot combos from Blore-Edwards. They are glorious! I will post pix when I get a chance.

These make it easy to add a GR/IN/OUT to the front panel without too much fuss.

Thx,

Mike
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Phrazemaster

As promised, here's a snap of the Ed Blore Switch/Pot combo.

Glorious! And it fits...

Mike
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Cool,
I have a extra UA 176 faceplate  FOR sale  If somebody is interested...Fits UA 176 weston meter. But Could be filed out If somebody using bigger meter. Like new condition. Contact for price.
Thank,s
John

And closeup.
John


 

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