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roger bayliss wrote:The instrumentals Apache and Quartermassters Stores were using an AC15 series 2 normal channel, then they switched to the AC15 series 3 which had a brilliant channel which cuts the bottom end emphasising the top end.
The first AC30 was essentially non top boost like the series 3 with brilliance, and by 1961 the top boost was added as a bolt on unit. Eventually the top boost was included as standard, from memory it could have been 1963 or late 62.
Audiom speakers early on then celestion blue featured around the time the top boost circuits came out I believe.
Here's a summary of the amps used in early career.
https://drive.google.com/file/d/1NOTREf4xjFtk1Oh7gSXMRmkD3RVPc1PB/view?usp=drivesdk
roger bayliss wrote:The first AC30 was essentially non top boost like the series 3 with brilliance, and by 1961 the top boost was added as a bolt on unit. Eventually the top boost was included as standard, from memory it could have been 1963 or late 62.
JimN wrote:roger bayliss wrote:The first AC30 was essentially non top boost like the series 3 with brilliance, and by 1961 the top boost was added as a bolt on unit. Eventually the top boost was included as standard, from memory it could have been 1963 or late 62.
I'm sure it was later than that, Roger. the JMI price list of 1965 (I still have one) still differentiates between the AC30 Twin Normal and the AC30 Twin Top Boost.
It lists a wide range of AC30s, with the top model being... gulp...
...the AC30 Supertwin Normal II with Reverb and Top Boost, priced at over £200 (it is stated to use two speaker cabinets, though I don't know exactly what that means since I've never seen one).
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