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Old 26th July 2011, 04:09 AM   #1
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Default Reuse these sockets and tube choice question

On the mini-console that I am building for my grand daughter I am repurposing a preamp chassis from a hammond L101 for the preamp section of this project. The chassis has three 9 pin sockets and one 7 pin. I will need to replace the 7 pin with a 9 pin but I am considering just using the existing 9 pins rather than replacing with new.

This is a gift so I don't want to cut corners but as I look at the old sockets they look like pretty good quality and are tight. I wonder if I would really gain anything by putting in new ones.

I would like your thoughts on it.

Click the image to open in full size.

Click the image to open in full size.

Also my design uses 12AY7 for the CC gain stages and 12AU7 for the CF stages. I chose the 12AU7 simply because I have a bunch of used ones for the initial testing (will use new one for the final product) and since in this case they are not driving difficult loads. I am also considering redesigning for using either all 12AY7 or using 12AT7 for the CFs. I suppose ATs would give the best CF performance while AY gives the advantage of having no way to mix up the tubes.

Do you think it really matters much what I use for the CFs? Not concerned about price here at all.

Finally any suggestions on what to use to clean up the yellow gunk (flux) on those old sockets?

Thanks for your time.
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Old 26th July 2011, 04:14 AM   #2
dvh99 is offline dvh99  Netherlands
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CH3CH2OH, dont use expensive brandy or whisky though .
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Old 26th July 2011, 04:20 AM   #3
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Maybe a bottle of Ripple. Sorry about the double post. Not sure how that happened.
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Old 26th July 2011, 04:28 AM   #4
49 - for the 18th time - again!
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Those sockets look fine - no cracks - no sign of damage by heat or abuse - good looking contacts - should be good to go.

I use acetone for flux removal with a short bristle brush - stiff bristles.
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Old 26th July 2011, 05:26 AM   #5
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acetone may be too hard on the old plastic, maybe try just water first? Rosin is water soluble.
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