Rocinante said:The 22113 was the summing stage.
Some versions used 15C1 or MMC wired as 15C1 in all stages, some used 2128 and 22113. I believe other cards were used in later models too.
Rocinante said:The 22113 was the summing stage.
My 15C1s are positive, but I have seen the schematics you are talking about. Positive grounds on the negative version certainly have a mysterious wow factor and probably stem from the germanium amp cards that we have all heard about from Olympic.Squeaky said:15C1 is negative (early modules) and 2128 is positive
Rocinante said:Yes you are right they were all used in the summing stage. With my own eyes (via pics) I saw the 22113 used as the summing stage.
When would have it been?ruffrecords said:P.S. The earliest form of virtual earth mixing I know of n the UK is in the EMI TG12345 mixer.
Cheers
Ian
The design spec was apparently drawn up in 1967 and it was delivered in time for the recording of Abbey Road by the Beatles which was released in September 1969. So presumably some time in 1969.abbey road d enfer said:When would have it been?
I was at school then; the concept of opamps was relatively new. My teachers considered only their use in analog computers; anyway, audio was frowned at ("music boxes").ruffrecords said:The design spec was apparently drawn up in 1967 and it was delivered in time for the recording of Abbey Road by the Beatles which was released in September 1969. So presumably some time in 1969.
Cheers
Ian
abbey road d enfer said:I was at school then; the concept of opamps was relatively new. My teachers considered only their use in analog computers; anyway, audio was frowned at ("music boxes").
Whoops said:Hi,
yesterday I scanned the full tech docs I have for the Helios Musicland console so I could help in the "stay at home type 69 project" thread here:
https://groupdiy.com/index.php?topic=74779.msg948062#msg948062
I'm posting the individual docs in the Tech Docs section.
Hope it can be helpful for you and future projects
Best Regards
Strat96 said:It came with the console when I bought it. Lots of parts missing and I have been in the process of collecting parts and restoring it for seven years.
Whoops said:Hi,
were you the buyer of the Ebay auction?
If so Im happy you have that console
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