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Found 1 result

  1. Ozzie, Ozzie, Ozzie. All Australian made Miniwatt tubes (at least 50 years old) on a Murbue base. Black Lace was always going to be a very Ozzie build. All tubes: 6V6, 6SN7 and 5U4 are Ozzie made. The 6V6s are black glass and spent 40 years under a house nearby uncovered. To keep with the old school feel carbon film resistors are use throughout except for the cathode Rk which are 5W wire wounds. The PS is split at the Russian 4uf PIO first cap. Two 5H Hammond chokes split the PS to pass through a C-R-C filters. 100uf-6.8ohms (carbon film)-100uf. Even at the driver tube the PS is split in two for two drop down resistors each with a 47uf snubbed electro for storage and further filtering. Two 5H Hammonds handle each stream of HT. So as you can see a dual PS stream right from the first cap all the way through. Most filter electros are snubbed with 0.1uf high voltage polies. Only with my ear pressed hard into the bass cone can I hear the very slightest hum. From 1m nothing. Russian PIO caps are used for inter-stage. All hook-up wire was off-cuts from the power tranni and OPTs. The solder was from the 60s or 70s - lead, tin and copper. The sockets are a resin style, no ceramics around here! OPTs Edcor strayed black. The bypass caps on the 6SN7 are bypolar and the bypass caps (Ck) on the 6V6s are low ESR electros. The black lace the amp (Black Lace) has been photographed on will be cut to for a dust cover when the amp is not in use and will be weighted down with clear and emerald glass beads. A great job for my 85 year old mother who loves doing this sort of thing and is good at it. Tomorrow I get the whole day to listen to the amp. All tubes should be run in but all other components are new. The sound for now playing laid-back jazz is crisp, fast and uncoloured. Tomorrow's hard core listening may reveal other characteristics. Now for some images.
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