20 Sep
2010
20 Sep
'10
11:49 a.m.
On 2010 Sep 19, at 6:14 PM, Chris Elmquist wrote:
<comes out from bushes> ah, that was me.
Was a great time and really a blast to dig into the Alto. We
definitely
improvised, not having a stock of uA709 opamp on hand... we just
bypassed
that regulator circuit and stuck a 7805 there instead, which was
pilfered
from Vince Briel's spare parts stock for his Altair8800micro kits.
Too much fun.
If the 709 was a TO-99 (can) package and you need to replace it, I have
lots of 741's in TO-99.
Just mentioning it in case it is difficult to find a 709 in TO-99. (DIP
should be easy to find something to substitute.)
Good luck Nick and keep us posted.
Chris
On Sunday (09/19/2010 at 09:20AM -0500), Nick Allen wrote:
> Some GOOD news, at the Midwest VCF, Chris (from St Paul, don't
> remember
> last name) and Eric Kudzin were huge helps and took Jim S's
> recommendation and repaired the 5V Op Amp fixing the 5V issue and now
> the Disk Drive SPINS! We still need to repair the CRT and diagnose
> the
> rest of the system, but we are making progress!!
>
> Thank you Jim (for the amazing feat of properly diagnosing remotely
> via
> schematics) and thank you Chris and Eric for your endless hours of
> help
> at the VCF!'
>
> I will keep everyone posted as we progress, Eric and I will be working
> over the next several months to restore the Alto!