#1 PCL86 SE Ultralinear Monos
Posted: Thu Aug 09, 2018 1:15 pm
So, finally I'm getting around to building me a nice set of PCL86 monoblock amps.
The PCL86 variant of the ECL86 triode/pentode is such a great valve that it would be silly of me not to build
something that would do them justice and be of manageable size. The existing spud amp, cobbled out of the Pink SET, is so big considering what it is being asked to do, it borders on stupidity. In short, the existing amp is overkill on a massive scale. It sounds absolutely fantastic as a lash up, but hopefully (fingers crossed) that's not because of the overkill. If it is, I'm on the road to dissappointment. However, as they say, "nothing ventured..." etc
Racking my brains about a pair of chassis, I did a bit of lateral thinking and got a stainless steel door kick plate...
https://www.screwfix.com/p/eurospec-doo ... 50mm/5759p
Cut in half, and suitably punched and drilled, this will make for a nice pair of 6" x 14" quality top plates, for not much money.
It might even be fun to cover the top plates with the left over purple Rexine so that the amps match the speakers.
Surround will be 9mm plywood, veneered with the left-over walnut strips I saved from the Fane Fullranger project.
The circuit is based around the 1962, Mullard " Economical 3W Stereophonic amplifier" but with a lot less gain.
The PCL86 variant of the ECL86 triode/pentode is such a great valve that it would be silly of me not to build
something that would do them justice and be of manageable size. The existing spud amp, cobbled out of the Pink SET, is so big considering what it is being asked to do, it borders on stupidity. In short, the existing amp is overkill on a massive scale. It sounds absolutely fantastic as a lash up, but hopefully (fingers crossed) that's not because of the overkill. If it is, I'm on the road to dissappointment. However, as they say, "nothing ventured..." etc
Racking my brains about a pair of chassis, I did a bit of lateral thinking and got a stainless steel door kick plate...
https://www.screwfix.com/p/eurospec-doo ... 50mm/5759p
Cut in half, and suitably punched and drilled, this will make for a nice pair of 6" x 14" quality top plates, for not much money.
It might even be fun to cover the top plates with the left over purple Rexine so that the amps match the speakers.
Surround will be 9mm plywood, veneered with the left-over walnut strips I saved from the Fane Fullranger project.
The circuit is based around the 1962, Mullard " Economical 3W Stereophonic amplifier" but with a lot less gain.