Zukan wrote:Ah, sorted it. AA deciding to be obscure about model numbers. It is in fact, as you rightly pointed out, the 2052 and 2054.
You mean the 2252 -- which was (as far as I know) Neve's first diode-bridge compressor and employed germanium transistors in the output amplifier. I believe this design suffered from quite high levels of distortion -- always an issue with diode-bridge designs -- which, although potentially attractive in music applications, was deemed unacceptable in the broadcast industry which was Neve's biggest market at the time.
So Neve revisited the design and came up with the improved 2253 (not sure if that was germanium or silicon transistors I'm afraid) which apparently did
meet with the IBA's broadcast equipment specification requirements.
Some short time later the 2254 was developed which was based on the 2253 but had additional features and more complicated side-chain circuitry I believe (so it could limit and compress).... and then the fabulous 33609 was essentially developed from the 2254 (in a number of different variations over the years).
Geoff Tanner at Aurora audio is probably your best bet for proper first-hand information.
These are 2252 compressors:
These are 2254s:
And this is a 2253!