New PT285Mi- Created a version of the PT285M using the Dual Voltage Mains approach from the PT275Mi. Theres a PDF attached to the Product Page now.
So this will have (2) parallel 120Vac mains- used in parallel concetion for 120VAC/60Hz and in series for 240Vac/50Hz. 120/240Vac: 285-0-55-285Vac (150Ma): 3.15-0-3.15Vac (4A):
5/6.3Vac (2A). Basically a good option for Marshall 18W and Vox AC15 projects if you want to use a surface mounting PT and need dual mains.
I've picked up some EI7/8 x 1-1/4in Bobbins. The 1st thing we wound on that was a version of the OT17PP called an OT17PP+VOX (8K: 4/8/16 ohm 20VA
25Hz-20KHz) using a 5-section interleave. With the extra iron I should be able to create HiFi versions of the OT10SE and OT17PP or 20PP .
It has been VOX month.
Besides the OT17PP+VOX, I was also asked to build a Laydown version of the PT285M power transformer. Also worked out a small PT205.1 power transformer for a Lil Night Train (See gallery pix). Might
need to drop the B+ just a bit more on that one, but it seems to be somewhere in the 260Vdc to 290Vdc range. If you know the exact B+ target, drop me a message. This will pair up nicely
with the OT2PP or OT5PP+ output transformer for repairs and upgrades
Current new projects include:
PT110.1 (USA)- EI87 Power Transformer- There has been some
activity for small 50L6 and similar tube guitar amps lately. This is a small power 20VA transformer the size of an OT20PP USA in VC87 covers. Specs 115/120Vac Mains & 110-0-110Vac (Approx
150Vdc B+) at around 40mA. We did one with a 50Vac heater. It should fit in a pedal...... This is a variation on the PT190.1 and PT240.1 design for 2W - 3W amps.
PT260.2 Version has been running lately. It's similar to a Hammond 270D but with a 55V bias tap &
PT275Mi has been running fairly often on custom orders. It's basically a little larger 275-0-55-275 Vac (120mA) + 3.3-0-3.3Vac(3A) and
5/6.3Vac(2A) heaters. I've been setting this up with a pair of 120Vac mains windings that are used in Parallel for US (120Vac) and in Series for Int'l (240Vac) operation. I have a PT330Mi
and PT285Mi design ready and proven as well.