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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 15th July 2019, 10:31 PM   #11
zman01 is offline zman01  Bangladesh
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Matt,

Here's an example of a ready made chassis which you can get from Mouser:

1444-17123 Hammond Manufacturing | Mouser

I think you have to order the bottom plate separately.

Btw, I have no experience with this chassis.

Did you install a log pot or a linear pot?
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Old 16th July 2019, 05:57 AM   #12
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Hello. Thanks for the chassis suggestion.

My pot is actually a SMD stepped attenuator bought from ebay, mainly because I read some posts somewhere where people were saying they were good. The ebay description is below.

DACT Type SMD 21 Stepped Attenuator ( Audio Log Type / stereo ).

I am beggining to wonder about this to be honest, i am thinking about buying a cheap log pot and trying it out instead. If it is any good I could change it for an Alps or something better, but of the same values.

Thanks

Matt
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Old 16th July 2019, 10:58 AM   #13
zman01 is offline zman01  Bangladesh
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Matt,

I've used the same type of attenuators in a few amps/preamps - they've worked fine...

Let's see what other folks have to say about "too much gain" in your case.

- Zia
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Old 16th July 2019, 01:52 PM   #14
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Cheers, is it possible I have installed it wrongly to get this effect? Sorry not very familiar with this stuff.

Thanks

Matt
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Old 16th July 2019, 05:25 PM   #15
flyingmattyboy is offline flyingmattyboy  United Kingdom
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I have done some experimenting tonight with different sources.


RESULTS ARE.


Homebuilt 834p based phono stage - super loud on click one, even louder on click two, click three would be way too loud for my ears in our room, so i didn't go there. silent in the home position.


Yamaha CD player - The same as above.


Smartphone playing amazon music through a Bluetooth Puck - the source volume is variable so i turned it right down to 1\3rd. This meant i was able to mess around with the Pot on the SSE more. Findings are - the volume is variable over the first 4 or five positions getting louder from position one to 5, position Zero is silent. There is no audible change that I can detect through the 15 or 16 positions after position 5 though. Sound Quality is superb no audible noise or distortion that I can detect anyway.


Any one got any ideas what might be causing this please, I am using Alpair 7.3 speaker drivers that are connected to the 8 Ohm tap. They are approx. 87db sensitivity but some do think that this is a conservative rating.


The hot spot on the valve does definitely move with the valve if you change them over from left to right. I also tried som 6P3S-E's that I have, these had an even glow throughout the hole tube so I am no longer worried about this.


Thanks


Matt
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Old 17th July 2019, 04:09 PM   #16
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Sorry to Bump. But anyone got any ideas about my potentiometer problem?
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Old 17th July 2019, 06:29 PM   #17
zman01 is offline zman01  Bangladesh
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Matt,

Can you take a picture of how you have wired the pot?
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Old 17th July 2019, 08:32 PM   #18
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Firstly Zman thanks for sticking around. I am glad you are trying to help.

I sketched it out, sorry about the poor quality of the drawing.

Appreciated.
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Old 18th July 2019, 08:59 PM   #19
colnago55 is offline colnago55  United States
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It looks to me from your diagram that you may have a wiring problem. Here's a diagram from the tubelab site. Only the center wire from each connector needs to go thru the pot.
The shields go to signal ground (as do a pair of pins on the pot.) Check that your pot is oriented correctly with the diagram and that you have no solder bridges (a problem I've had.)
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Old 19th July 2019, 05:25 AM   #20
flyingmattyboy is offline flyingmattyboy  United Kingdom
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That was the diagram I used and I have triple checked against it and my wiring looked ok to me.

When you say " centre wire " is that the red and orange wires on the diagram?

Are the pots directional? Could I of soldered it in upside down compared to the Tubelab diagram?

Thanks

Matt
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