Ex our technical workshops, PERFECT for low power tube/valve/glass bottle preamplifiers, low power power amplifiers and other equipment requiring HT rails in the region 300 ~ 350V DC (after rectification and filtering)
Of course if used in conjunction with thermionic valves (also called tubes and old school "bottles"), you will still need to have a separate transformer for the heater supply of the tubes - this transformer will ONLY supply a single HV output at the secondary.
Never heard of Harbuch? (If not, it is then likely that you have been living in a cave!)
Harbuch Electronics is a very respected Australian manufacturer of inductor products i.e audio, video and power transformers - their products were widely used in the local broadcast and audio industry. Well known for their very high quality, high reliability products - particularly in the field of professional audio.
HARBUCH ELECTRONICS (Australia) - Toroidal Transformer
HERE is their website (although it doesn't seem to have been working properly for quite some time now)
Made in Australia
Model: B2741
Primary: 240V AC
Secondary: 250V AC @ 0.12A (30VA)
Both windings are colour coded, Orange is the primary and Red is the secondary
Although not in the photograph, this toroidal transformer WILL be supplied complete with all mounting hardware i.e top & bottom plastic discs, one metal disc and centre bolt with nut
DIMENSIONS:
70mm diameter x 35mm height
Epoxy potted centre
Primary & secondary leads 200mm in length
TESTING:
Previously used in the workshop for some audio preamplifier R&D but no longer required, it was only powered up once!
A little surprised at the output AC voltage measured, I can only assume that under load the secondary will drop back towards 250V or so, the intended output
Tested using the domestic AC supply, nominally 240V AC (actual voltage today was 240.9V AC)
Secondary voltage measured at 296V AC NO LOAD
Normally you would then shoot this AC output off to a rectifier, followed by filter system and possibly (depending upon the equipment requirements) some regulation.
