Motorola SK-13M 1959 2 channel stereophonic
Posted: Wed Apr 19, 2023 3:25 pm
I didn't get a good picture of the front but, on right is basically the all-in-one cabinet, phono-only version of the two-cabinet SK-14 and uses same preamp and two channel amp (HS696) as the SK14. The SK13 and SK14 appear to be the first all-in-one stereophonics offered by Motorola, who did not hold back in the power department.
The record storage area could be sacrificed for a drop-in tuner like the "gull-wing" SK29 has (pictured on left). Both heading to new owners after a refinish by "not me"
There are only two downsides to these amps were addressed on subsequent three-channel models:
1. No line fuse or safety capacitors on 120 volt mains. No random holes to add a fuse holder like a Mag 9300 has.
2. Wafer-style tube sockets that get hot, discolor and require retightening/respringing of contacts.
This picture was taken after loading/padding both after a test session in my garage last week may have damaged my hearing
. I was not using a record player on either one, as they were out for service elsewhere, to my great relief
This is a cautionary note: A CD player (1 volt p-p line) into stereo tape OR phono inputs on both of these models, which are designed for the .4 volts output of a Sonotone 8t ceramic phono cartridge, will literally make a volume setting of 2 too loud for close range. It may have been the combination of this and Jensen 4 and 5 inch cone tweeters fed thru a new crossover cap. I don't know what it was, but be careful
this IS an occupational hazard!
The record storage area could be sacrificed for a drop-in tuner like the "gull-wing" SK29 has (pictured on left). Both heading to new owners after a refinish by "not me"
1. No line fuse or safety capacitors on 120 volt mains. No random holes to add a fuse holder like a Mag 9300 has.
2. Wafer-style tube sockets that get hot, discolor and require retightening/respringing of contacts.
This picture was taken after loading/padding both after a test session in my garage last week may have damaged my hearing
This is a cautionary note: A CD player (1 volt p-p line) into stereo tape OR phono inputs on both of these models, which are designed for the .4 volts output of a Sonotone 8t ceramic phono cartridge, will literally make a volume setting of 2 too loud for close range. It may have been the combination of this and Jensen 4 and 5 inch cone tweeters fed thru a new crossover cap. I don't know what it was, but be careful