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What an amp. Great, full and sweet cleans and it was a fabulous pedal platform. Alas, the owner wouldn't sell it to me.
Was it the speakers in some versions that were seen as the weak aspect and if so, what were people swapping them out for?
I also used to use the JC Model on my Roland Cube 60.
Great amps
The new amp turned up at 1145. Kids out of the door at 1715 for a weekend with their father. Box open. Amp set up.
Yeah. Oh yeah.
A 120 in this apartment would be been too much and really so is this. It'll be perfect for the move in the future. The chorus is excellent as expected. The earlier ones (silver corner protectors) had a different sounding chorus to the later 80s ones (black corner protectors) that you'll hear on Smiths records. Earlier chorus seemed to have less headroom, sound a bit thicker. I actually preferred the 80s one, you could stick more dirt into it without it going splatty. The JC40 chorus is very much in the 80s territory.
Amp has less bass than the 120 as you'd expect. Lovely reverb, lovely balanced sound overall. Much lighter than the 120 and easier to handle. It isn't for everyone but it's definitely for me.
From what I can see online, there's been some differences over the years.
Pre-80s 120s and 60s definitely had different resistors on the inputs to later ones.
JC120H (head unit) - High Low inputs at -32dBm, 1M ohm impedence
Modern JC120 - High Low inputs at -30dBm, 680k ohm impedence
JC60 going by the service notes: High is listed at 220k ohm, low is 82k ohm.
What does seem consistent is the use of a 33k resistor in the circuit after the High jack and a 66k resistor after the Low jack.
Both the JC40 and JC22 amps lack High Low inputs. The JC22 has one input, the JC40 has two for stereo use. Both manuals say the inputs are -10dBm, 1M ohm impedance. So this is quite different from the current JC-120 which has High and Low inputs, 680k impedance.
A chap on Solid State Guitar Amp forum has uploaded a JC40 schematic. Once I've approved in the forum, I'll grab that schematic and take a look.
I'm wondering if a little passive attenuator before the input would get it sounding more like the old JC120 I remember.