Doesn’t this
just look the part! It almost looks like it should have a big tuning dial….just
like the old-fashioned radios!
As received.
Note the bowed-down chassis….in the centre/back. No side screws were almost
certainly the main cause of this!
Same again
only a close-up. Kitted out with Russian tubes but….where is the missing one?
The output
transformer bolted to the speaker, quite a common thing on many of the older
amps.
The speaker
field-coil. This type of speaker doesn’t have a permanent magnet, instead it
has a coil, which is basically an electro-magnet. When currant is pulled through
the winding, as the output tubes warm-up this then energizes the speaker which
also doubles as a choke for the amplifier itself. Again, quite a common feature
on many old kinds of equipment like radios, amps etc.
Here all the
changed components can be seen, including the main volume pot. This was so bad that
I had no choice but to replace it. If you look closely at the ground wires
coming out of the power transformer (compare them with the photo above), you
can see how I have sleeved them with old used/matching looking sleeving,
isolated them from the chassis and in-fact used a new
“grounding-order", finishing with just one chassis ground, at the input socket.
All earth-loops and eddy-current problems were now gone!
Chassis
straitened as best as possible (this is a bit of a weak point on this model) and now
securely screwed to. Also, the missing 6SL7 tube has appeared! It was
lodged inside the speaker!