|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
68.0.149.86
In January I finished my build of a pair of PSE 6C33C monoblocs. The Lundahl iron, circuit boards and many of the parts were sourced from Kevin Carter at K&K Audio. Kevin designed the circuit as well. I was using a pair of DRD 300B monoblocs for more than 10 years previously. The new amps are rated at 35W and as well as I have enjoyed the 300B amps, I have never had dynamics like this from my Froy 90dB speakers. The rhythm section of bands have achieved more prominence in the presentation and the music has sense of ease that draws you in deeper.
The chassis' were built using 4" aluminum channel, .125" aluminum plate and mesquite that was harvested from a tree I had planted in the front yard 25 years ago. Tree was cut down about 6 yrs ago because the roots were lifting the concrete driveway. The chassis work was more involved that the electronics. If I had to do it again, I probably would use the steel chassis' available from K&K but still veneer it with a wood of my choice. Hook-up wire used was 22ga fine silver for the signal path and 20ga fine silver for the power supply. Circuit was built using Kevin's design with the addition of a pair of Mundorf silver foil bypass caps. Kevin has a provision for bypass caps on the output board.
Follow Ups:
Muck,
Looks great. Kevin has been my goto supplier on signal components for better part of 15 years. Good Dude.
Stuben
Very nice looking. I'm not sure how low the 6C33C tubes are mounted in the chassis, but they need adequate ventilation to avoid premature failure. Here's an Almarro as an example. In any case beautiful work.
Jim
Circuit boards are mounted on the underside of a mid-plate inside the chassis and the tube sockets are mounted on the top side of that mid-plate which is just below the underside of the top plate. There is a 2 3/4" hole in the top plate that each 6C33C goes through to mount in the tube socket which provides clearance between the plate and the tube. Cut-outs on the mid-plate provide access to both sides of the circuit boards when the top and bottom plated are removed. On the bottom plate there is a cut-out with 1/4" hole perforated metal covering the opening to provide air circulation from below the chassis. The amps run warm but these are running class A so heat is to be expected but I think the 6C33C tubes are getting adequate ventilation.
Great looking pair of amps! Photos of the innards would be helpful if you have time. Congrats on a project well done!
--------------------------
Buy Chinese. Bury freedom.
Here's the innards!
Excellent work! It's obvious you spent a lot of time on that chassis!
--------------------------
Buy Chinese. Bury freedom.
Nice, I run PSE 6C33Cs as well from Wall Audio (Opus P50 monos). Not as beautiful as yours but that 6C33C can make some music!
What are the input tubes?
Did you need to match the 6C33Cs?
Great looking amps.
ray
Input tubes are 6J49P, another Russian military surplus tube. The 6C33C are matched pairs.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: