i love this type of point to point construction , where the back of the valve socket extends backwards and tags are riveted to that tube up the length of it so as build that particular valve stage right on the valves base. beautiful and simple. at their age these amps have plenty of leaky hi voltage caps. they work and sound good .. but you can tell they are on the edge of crapping out completely. the leaky coupling caps cause the controls to be extra noisey , also can cause the amp stage plate resistors to burn out , and usually false bias the following stages to the point of almost cut off. the power supply sags and the whole thing goes about 25%. i’m using french made solen brand parts to repair these amps. ive had only good experience with them. they dont leak d.c at all and are not physically oversized.
Tag Archive for 'ampex 351'
a client has delivered these ampex machines – ex of capitol studios L.A. – to me - for to reclaim them up and into a new professional life. first thing has been to strip them free of their remote control and varispeed switching wireing. to return their control back to personal only. and to bypass the signal tone injectors from the input circuitry. then to clean the decks down careful lube clean up check over electro mechanical features of the tape transporters. chunky old school stuff . from another world of engineering long ago long in the past . the cleaning and clearing has revealed - one very munted capstan shaft – one bubbled rubber shot pinch roller – and one scratched up feed idler wheel surface . so far. braking and control functions seem good. a bearing bit gummy. so carefullydismantle – clean – lube – refit – quick beer.
i have to focus now on getting one single stereo machine going all good inside the next two weeks. so the 300 transport deck 1/4″ 2 track with stereo model 300 – 3 octal tube record playback amplifiers. capitol#54 . the total yummy valve tape machine. it actually oozes dean martin. just today ive swapped out the 60hz capstan motor for my 50 hz spare. so as to get the speed of this master machine as close to an actual 15 inches per second as possible. with that sorted and after a feed idler overhaul – this transport should be sweet. then to dismantle – recap the amps , check thru and prep for full tape recording alignment and greatness.
it was nathan’s jazz dream. to make a great record in one weekend. wild jazz quartet music recorded thoroughly old jazz school. big fat nuemann mikes all up the place. single mike on the drums. love that. fat 3/4 bass. stinking big steinway concert grand for gods sake. and sax. just … such a good sound. so expansive and expensive. recorded live mixed on york streets neve direct to my ampex 300/351 1/2″ stereo tape deck . the 300 was made to have a robot human stand in front of it pushing the buttons. so i was tape op. i didnt have a close monitor at all and have dreamt/drawn up this ultimate rebuild for my mr ampex. the massiveman.
at last! this machine is alive and on line. its taken an age to rebuild and modify. and finally has brand spanking new 1/2 ” 2 track heads. the recordings are very fat and clear. very kind to transient peak levels. you can drive more sound signal at him. and he never really breaks up … just gets more glued. the playback is awesome. really big and solid. ultimate analogue really …hugh from goldbaby recorded and resampled his TR808 drummer from this machine. so send me a soundfile and i’ll record it onto mr ampex and i guarantee youll like the difference that a good tape recording can make. the first demo can be free. thereafter by easy negotiation.