Hi peranders,
Thanks for your reply.
Im thinking this amp should deliver around 50wpc ? What do you think about replacing the 2N3055 in the output stage with something like MJ15003/15004. Would that provide much improvement in sound ? Do you think it would require adjustments if this was done ?
I've looked and looked, but there seems to be very little information around...
Thanks again
Thanks for your reply.
Im thinking this amp should deliver around 50wpc ? What do you think about replacing the 2N3055 in the output stage with something like MJ15003/15004. Would that provide much improvement in sound ? Do you think it would require adjustments if this was done ?
I've looked and looked, but there seems to be very little information around...
Thanks again
I think Sonab was just a local swedish brand back in the 70's.
I didn't even remember them making amps. They were mainly
known for their speakers, but there were a lot of swedish
brands of speakers, very few of which were known outside
Sweden I guess. Maybe some of the other swedes on the
forum knows something more about the amp, but I doubt
it had much of a reputation even here.
I didn't even remember them making amps. They were mainly
known for their speakers, but there were a lot of swedish
brands of speakers, very few of which were known outside
Sweden I guess. Maybe some of the other swedes on the
forum knows something more about the amp, but I doubt
it had much of a reputation even here.
Hi,
thanks for the info!
I think that the p4000 and the r4000 are somewhat different. My p4000 definately uses a 2n3055 and a Motorolla for the pnp. The apperance is also a little different as it doesnt have the dials next to the selector switch (it has mic in, and headphone out). However apart from that the amps look identical.
I got the amp with the left channel blown. So im trying to decide whether i should try to fix the amp, try to refund it or whether to try to put something else into the case. While im at it, would anyone know what the problem in the left channel could be?
Cheers,
Vas.
thanks for the info!
I think that the p4000 and the r4000 are somewhat different. My p4000 definately uses a 2n3055 and a Motorolla for the pnp. The apperance is also a little different as it doesnt have the dials next to the selector switch (it has mic in, and headphone out). However apart from that the amps look identical.
I got the amp with the left channel blown. So im trying to decide whether i should try to fix the amp, try to refund it or whether to try to put something else into the case. While im at it, would anyone know what the problem in the left channel could be?
Cheers,
Vas.
I concur that the design is great looking. All black with orange/red lights.
I picked up a 3000 sonab for $12 at snowline (sort of like a salvation army). Unfortunately it didn't play and after mucking around with it for a while, decided to strip it for parts. Good knobs, lights, case. The transformer looks impressive. Engel I think. with 55V and 12V secondaries. The output transistors were MJ9001 or something (don't have it with me).
The construction details were great. Really good pots, all elna caps, nice case with heatsinks I plan to use. The circuit board on the other hand looked on the cheap side. Heat during the years of operation had warped the traces and bubbled the protective layer in multiple spots.
I'm wandering what I can use the trafo for?
I picked up a 3000 sonab for $12 at snowline (sort of like a salvation army). Unfortunately it didn't play and after mucking around with it for a while, decided to strip it for parts. Good knobs, lights, case. The transformer looks impressive. Engel I think. with 55V and 12V secondaries. The output transistors were MJ9001 or something (don't have it with me).
The construction details were great. Really good pots, all elna caps, nice case with heatsinks I plan to use. The circuit board on the other hand looked on the cheap side. Heat during the years of operation had warped the traces and bubbled the protective layer in multiple spots.
I'm wandering what I can use the trafo for?
As I recall, there were two amps, the cheaper one made by Cambridge Audio and the better one made by Yamaha.
The cheaper one was still available here (as a Cambridge) until about four years ago.
I just missed a 4000 on eBay, was going to use it together with my Sonab 75S turntable. Nostalgia rather than sound quality.
The cheaper one was still available here (as a Cambridge) until about four years ago.
I just missed a 4000 on eBay, was going to use it together with my Sonab 75S turntable. Nostalgia rather than sound quality.
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