Posterous theme by Cory Watilo

Filed under: Mundorf

shared ground mundorf

the mundorf m-lytic have a common ground, rendering it unsuitable for the janus design as i wanted to use the capacitor in C3 and C4 positions.

bummer bummer... got to get a few more capacitors for the janus section. i ended doing everything up on a perf board as the whole lot is quite heavy to be mounted by double-sided tape and zip cord. also, there is not enough space for the GE oil capacitor as the first capacitor.

i'm doing up the amp bit by bit... slowly, but surely...

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.

mundorf silver in oil capacitors

Finally got some high end capacitors... I don't really have a use for these in my 5687 preamp nor my DRD, since both would not allow me to use high end capacitors in the signal path... It happened that some echolofter is selling off his used Mundorf Silver in Oil 4.7uF capacitors at a cheap price. I was too tempted, and just grabbed them. The capacitors are really huge and heavy, but the leads are a little short... not much problem for a DIYer though. He mentioned that the capacitors are relatively new and suspect that they are not run-in yet. Well... I am just gonna use them as the first capacitor after the RCA83 rectifier in my DRD. Just need to find some time to open up the mono blocks and do the switch. The capacitors actually stated 4.7uF +/- 2%. According to my multimeter, the capacitance is 4.828uF, which is just a little more than +2%. So much for tolerance...