Vintage Synth Repair

--- In vintagesynthrepair@yahoogroups.com, "rakky" <pargroups@...> wrote:
>
> I'm about to start mucking about with a few old drum machines (DR-55s, Soundmasters and EDC). These were considered uneconomic to fix, 5 years ago. Now, a DR-55 can go for £200..
> 
> Usual problem with DR-55s is the 4011 chips pack up. Maplins are charging nearly a quid for a 4011, and I've found them to be a bit hit-or-miss. And they don't have any in stock locally. 
> Anyone have a suggestion for a cheap UK supplier?
> 
> Next-up, I have at least one machine which is playing-up as if the RAM chip is duff. Unfortunately, the chip is a Toshiba TC5501P-1.
> Again, any suggestions for a cheap UK supplier?
> 
> What's really annoying is that I had a tube of 4011s somewhere (5 years ago). Can I hell find them :(
>

The 4011 is a CMOS IC...Very common

Try Farnell

The TC5501 is a 256 Word x 4 bit memory chip..Vintage  

Try Ebay for that one