$49 Hitachi V-1100A for repairs

[jakeottinger]

Hi guys and gals,
I know it's not the best practice to be a newb and buy an oscilloscope that needs repairs but Looking at the photos I assumed the thing had been dropped on it's face and knobs were broken and that's all that was wrong. I powered it up and everything seems to work.  I figured it would be a simple fix.  However I'm having trouble sourcing the pots and knobs for this thing. Attached is a photo of the unit.
Any ideas on where where to get these pots? I'm afraid to take it apart at the moment since my bench is a total mess and I'd enevitably loose parts until I clean up.
Thanks for any and all replies!

[tautech]

Bugger, that's a shame it's so beat up. 

In the service manual the BOM may have clues to the value of the pots, type (lin or log) and the original supplier.

http://elektrotanya.com/hitachi_v1100a_v1070a.pdf/download.html
11.6 MB

Wait for "processing" to change to "get manual".

[jakeottinger]

Thanks for the tip on waiting for Processing. I saw this page before but found no way to download. I guess I just had to wait a bit.

[jakeottinger]

So one of the destroyed pots is a RV2701 part number 8410393 EWK-ANAS 10k+10k. Where the heck can I find that? google only shows phone number reverse lookup for some reason. It's the level control without wich I'm assuming triggering will not happen. Do you think a stereo pot will work? It looks like a stereo footprint. Any Ideas? Thanks guys/ gals

[neko efecktz]

Just a suggestion.
Possibly find one of the same model online in a "not working condition" and salvage the parts from that.
if there is board damage you may also be able to salvage boards from the Not Working unit.
In the dropped unit check heavy components on the boards and especially the transformer.

Bill.

[edavid]

So one of the destroyed pots is a RV2701 part number 8410393 EWK-ANAS 10k+10k. Where the heck can I find that? google only shows phone number reverse lookup for some reason. It's the level control without wich I'm assuming triggering will not happen. Do you think a stereo pot will work? It looks like a stereo footprint. Any Ideas? Thanks guys/ gals

It's a dual concentric pot, not a single shaft pot like a normal stereo pot.  (If you used a single shaft pot, you would have the same A and B trigger levels, which might not be so bad.)

[jakeottinger]

I'm starting to doubt the ability of my go to supplier.

[jakeottinger]

@edavid do you happen to know if that pot is linear or log? Or at least how to test lin vs. log to find out?

[jakeottinger]

@neko I already bought a non-working o scope, I understand the suggestion but I'm not about to buy another. I'd rather fix this one. Plus the only other Hitachi 1100A's out there sell for 4X the price I paid for this one. I'd much rather solder parts than steal them from other units that cost much more than I paid.  I have thought about buying another donor but just can't bring myself to admit defeat just yet...

[tautech]

How good are you at mechanical repairs?
Could the pot shafts be repaired?

Some closeups of the removed pot might spur some ideas rather than trying to find something that's hard to obtain.

[jakeottinger]

https://www.dropbox.com/s/11jl68sas9p76k3/20160707_231934.jpg?dl=0 sorry for the bad photography but the outer shell is completely severed.

[edavid]

@edavid do you happen to know if that pot is linear or log? Or at least how to test lin vs. log to find out?

I would think linear, since zero trigger level is in the center... it's very unusual to find a log pot in a scope.