compactron sockets

horror of horrors... the 6D10 compactron socket that I got are not the correct ones! I got the 9 pins instead of the 12 pins... argh...

guess i have to wire up the rest of the connections and the power supply sections first...

above is the work in progress janus shunt regulator, with 12w ohmite rheostats and kiwames in key locations. the power supply will be rectified by rca 6ax5gt, then 22.5uF GE oil capacitors, then the janus shunt regulator with mundorf m-lytics.

i reused the moskido chassis for the 6t10 mighty midget. had to drill new holes for mounting of the r-core power transformer (R0080-043) from vt4c.com and also additional holes for mounting of the james output transformer. the moskido chassis had 2 octal tube holes already drilled. i will have to use the front one for the rca 6ax5gt and the rear one for the ge 6t10 compactron. the janus regulator will be on a separate copper plate. i sawed it from my m10 preamp chassis (an early project that was decommissioned).

no matter how i planned, i will miss some parts... this time round, i missed the 200R cathode resistors for the mighty midget. all of the resistors to be used there are takman rex carbon film resistors. got to replace with kiwame...

some pics here.

Mighty Midget parts

Got some parts in the mail. They are GE 6T10 compactron tubes, Takman carbon and Mills wire wound resistors. Also in the picture is the Mundorf gold/silver wires. The wires are used as hookup in the multichannel UcD amp. Have to complete this before I can free up some space for either the Moskido or the Mighty Midget. I've already received the sockets for the 6T10. Got 12 of them from ebay... So if anyone needs a couple in Singapore, I am more than happy to sell some. ;)

I am more inclined to do the 6T10 at this moment. Possibly with a John Broskie Janus Shunt Regulator at the B+ as shown below.



Need to dig out some parts to see what I should use for the PSU. Cannot remember if I have the 6X5 or 6X4 rectifier tube around. If I am using a regulated B+, I may just use a CLC with the Nippon Chemi con 220uF capacitor.

Some pics here.

Slow progress on the UcD

Progress is rather slow on the UcD. Took some time to put in the shield as it will not fit. The aluminum piece is a little too large. Had to round the corners off. Then, with the screw below, it is a little too high. Had to file off the top portion where the wiring is supposed to connect to the UcD modules. Then, one of the psu harness is too short. Had to route by the side... so much for consistency.

I hope to be able to start on the signal wiring when I have time. Now currently finding out more of Steve Millett's 6T10 Mighty Midget. Heard Tony's version of this 3 watter at NoiSing08 and was very impressed by it.

Just over the weekend, I heard it at William's place with the actual 300v PSU on his 9" field coil Feastrex. First up was the driver-tormenting Sheffield Lab Drum and Track Disc.

Silence(from me)... Wow(from me)... it was just incredible...

Field coil drivers aside, I've already ordered the Takman resistors for the 6T10. The GE tube and sockets for this baby will be arriving soon as well. Will be mono blocks and using 6X4 rectifier tubes and probably my stock of Mundorf M-lytic HV cap or a combination of a GE oil cap plus the Nippon Chemi-con cap that I got from HK.

Hmm... question is, with my backlog of projects, should I start on this first? Perhaps so... it satisfies my requirements of low wattage, and esoteric (I did consider building something like the Fi 421A).