Transformers have been used at powerplants since the inception of alternating-current generation, a century ago. While operating principles of transformers remain the same, the challenges of. Transformers: Basics, Maintenance, and Diagnostics. The = = = = = = =.
![A-3880 A-3880](/uploads/1/2/5/6/125627032/911624055.jpg)
![Stancor interstage transformer Stancor interstage transformer](/uploads/1/2/5/6/125627032/963593565.jpg)
Click to expand.Most A-3830s would have been used as replacements in lo-fi applications, so you might not get replies from folks with direct experience. To squeeze good performance out of commodity iron, you want to operate it in push-pull, at no more than about half of its power rating, with most of its windings in-circuit, with a low impedance output stage (e.g. Triodes), and with a feedback loop including the transformer. A conflicting consideration is that using a lower turns ratio generally yields better HF response and closed loop stability.
Does that help? Click to expand.
Years back I had the opportunity to get iron I owned measured. At that time I had A-8072s, A-8053s, and a set of A-3801s in the mix. The A-8072 & A-8053 were spectacular whereas the A-3801 was marginal. Limited bandwidth and many resonant peaks as frequency rose. Certainly some of that could be patched over with feedback but not having to deal with it, or minimally deal with it, might be a better place to start. No sure where the A-3830 ends up but I'd bet it tracks the preceding.You'd have to dig out an old electronics catalog to check pricing but IIRC the difference between the Stancor hi-fi models such as the A-80xx series was 2X (maybe even 3X) that of the A-3801.
The A-3801 had a similar ratio to the universal replacements too. The higher you went up in line the greater the material cost as well as winding sophistication. Weight differences are striking too, something I always equate to bass performance w/ vintage iron -A-8072/8053: 6.5 lbs.A-3801: 4.8 lbs.A-3830: 1.8 lbs. Hello, this is my first post.I've got four A3830 transformers. Specs show 60 mA, for 1/2 winding, 20 wattsStancor Catalog p 5b & 29bI built the following. For 4 ohmPP 6V6 'Quality Amplifier for TV Sound, Radio & TV News, May 1951, p.44SE 6AQ5 (terminal 5 for feedback, 1 pos, 4 neg)Also see Amplifier Uses Cheap Output Transformers, Audio Magazine Aug 1955,p 11,12They sound Very nice.I built a stand alone regulated power supply for the amps, also a 6SN7 or 6FQ7 reg ps pre amp. Modified Ariel v3Another option would be to build a 6bq5 se (6p14 pcb) from ebay.
6p14=6bq5, there are some on youtube, one with a 12ax7.