200313 ES TMS Amplifier Operating Instructions ENV12
Remove the black plastic sleeves on the control shafts an
screwdriver, unscrewthe four
screws securing the cabinet.
on the lower left and right hand sides at the front and back.
Slide off the cabinet in a forwards direction.
amp: 2 x ECC88 or E88CC. Driver; 2 x ECC99.
Output: 4 x EL34 / 4 x 6550 / 4 x KT88 / 4 x KT120, depending on
amp: 2 x ECC88 or E88CC. Driver; 2 x ECC99.
Replacement valves can be purchased by mail order on the internet from
manufacturer JJ Electronics, Slovakia
or fromelectronic components suppliers, e.g.
or Distrelec Export, The Netherlands.
difficulties, please contact TMS.
, we recommend purchase in
located nearest the front
valves, ECC88 and ECC99, or short and tall
pin valves, respectively.
output valves are located towards the back and are numbered 1 to 4, from left to
Valves are best replaced in pairs at the same time, e.g. both pre
in order to have two valves of the same age, for optimalsound reproduction.
Remove valves by gently rocking them backwards and forwards while at the sa
exerting an upwards pull on them.
Note the location of each valve with a sketch on paper and by writing its position on the
glass envelope with a marker pen.
Replace valves by matching the pin pattern on the valve to the holes on the base (9
valves) or rotate the valve until the key engages (8
pin valves) and push the valves
completely down into the socket.
Put discarded valves in the recycling for electrical and electronic items.
TMS uses manual biasing for
output valves in its equipmen
automatic biasing because of reliability
and sound quality concerns
Biasing is unnecessary for the valves in a newamplifier whe
necessary when valves are changed or replaced and it may be advisable
once every two years to maintain optimal output stage performance.
