UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - OK need assistance or clarification of output transformer values

AdrianH · 6th Apr 2020, 9:56 pm

Well the line output transformer arrived today with a couple of volume pots, so it kept me busy for a little while, also building a speaker enclosure from a cardboard box as I have no wood to play with, so when restrictions get lifted I will be out to build a small wooden speaker/amp cabinet.
By the time that comes around I could well have a simple tone control included.

Not as powerful as thought driving the 4 Ohm speaker but loud enough for the miniature valve amp.

Total draw at 150 Volts is 25.4 mA, 6.3 Volt at 0.9 Amp so it is not the most efficient considering also using 12 Volt buck converters, but it has been fun to play and follow charts. Pentodes next!

Adrian

6th Apr 2020, 9:56 pm	#18
AdrianH Octode Join Date: Mar 2020 Location: Blackburn with Darwen, Lancashire, UK. Posts: 1,572	Re: OK need assistance or clarification of output transformer values Well the line output transformer arrived today with a couple of volume pots, so it kept me busy for a little while, also building a speaker enclosure from a cardboard box as I have no wood to play with, so when restrictions get lifted I will be out to build a small wooden speaker/amp cabinet. By the time that comes around I could well have a simple tone control included. Not as powerful as thought driving the 4 Ohm speaker but loud enough for the miniature valve amp. Total draw at 150 Volts is 25.4 mA, 6.3 Volt at 0.9 Amp so it is not the most efficient considering also using 12 Volt buck converters, but it has been fun to play and follow charts. Pentodes next! Adrian Attached Thumbnails