CHAMP ELECTRONICS -" THE VINTAGE VALVE
AMP HOSPITAL"
NOTTINGHAM, ENGLAND
SERVICING A SELMER BASSMASTER 50
AMPLIFIER HEAD
Though
this is not the actual amp chassis in the photos below; I have added
this photo for you all to see what a Bassmaster looks like in its
original case.
The
chassis as received from Daniele, in Switzerland. Daniele had contacted
me with the story of this Bassmaster. He had the chassis but there were
no power or output transformers. Also some other components were
missing too!
Again,
underside as received. In the top of the photo you can see the new
power transformer that I had already made for the job.
The new power transformer in place.
A good few components changed here.
A new power cable fitted, power-supply all rewired, and all looking/working good so far.
The making
of the new output transformer. Note the original 1960’s Selmer
laminations and matching, old/used end-bells (shrouds) too!
All finished, and once again
on a final soak-test. All the valves (tubes) were sent to me by
Daniele. He fancied using KT66’s rather than the original
EL34’s that this amp would originally have had. I made the output
transformer & biased the amp accordingly in both cases for these to
be used.
This amp would have had
originally a 2 pin version of the old Bulgin socket for the
"speaker-out" (next to the rear label)….fixed at either 8 or 16
ohms. Daniele wanted various impedance choices, so……I
used this hole for an impedance selector switch (4, 8 & 16 ohms).
After liasing with Daniele on the type of speaker output sockets, he
liked the idea of one jack socket & one Speakon. I drilled the new
holes for these & did indeed do this for him.
Rear….all finished.
Front…all finished.
Once
again…..showing the rear of a Bassmaster in its original case;
but not the actual chassis shown in all the above photos.
...............By the way,
the Bassmaster eventually became the first Selmer Mk1 T&B [Treble
‘n’ Bass] amp. Both models have exactly the same layout
& circuitry!
