3/9/2024 0 Comments Hammond h100 organ schematic![]() AAMOF, quite a few triodes don't measure up to the EF86, in the linearity dept. Please keep in mind the fact that sockets correctly wired for the 6Π15Π (6p15p) accept, without incident, 6BQ5/EL84s.īTW, the EF86 small signal pentode is very linear. A celebration of the Hammond H112 tonewheel organ which is now over 50 years old This track is arranged and performed by me on my own vintage Hammond H100. That socket takes a 0A2 gas discharge regulator for O/P tube g2 B+. That in turn, allows you to use (provided short, low capacitance, cabling is employed) an unbuffered 50 Kohm passive control center.Ī "hole shrinker" fitted with a 7 pin mini socket fills an otherwise unoccupied Noval position. A pentode voltage amplifier allows you to use 500 Kohm grid to ground resistors, without HF loss worries. When the 12BH7s show signs of wear, criss-cross them between the 2 chassis, for doubled service life. ![]() So, for a 2 Noval socket driver setup, consider an EF86 voltage amplifier DC coupled to 1/2 12BH7 "concertina" phase splitter, with 1 chassis using system 1 and the 2nd chassis using system 2. Think in terms of a buffered, "unity" gain, control center and the 2 VRMS O/P of a "standard" CDP. I believe the 12BH7 is part of the reverb amp / driver. ![]() Two of the latter are for EL84 / 6BQ5, with the remainder taking 2X 12AX7 plus one 12BH7. Each unit has power, output and reverb transformers plus six sockets - 1X octal rect. The problem with "classic" 2 tube driver setups, like Williamson and Mullard is excessive gain. I have here what looks like a pair of twin Hammond H-AO-43-1 organ reverb / power amp chassis. ![]()
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