Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dpm309 on August 01, 2011, 01:58:21 pm
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In my quest for a good sounding single ended amp, I came across this design that I am planning on building. A couple of years ago, I built a High Octane SE amp but am not happy with the sound. The HO is a great amp for high gain metal at low volumes but I want something that can do blues, classic rock and some country. This SE amp can use a variety of power tubes such as 6V6, 6L6, KT66, EL34, 6CA7 and KT77 for up to 12 watts+. It looks like a straight forward design using only 1 pre-amp tube and VRM [DC power level control]. There are a couple of switches that allow a fat/thin sound and a tweed/Marshall type sounds. This drawing specifies a PT rated at 315-0-315 at 120ma. Heyboer can make one to these specs for an arm and a leg. I am looking at other options for the PT such as a Hammond 272X (310-0-310, 70ma) or a BBQ International voltages Power Transformer (660V or 600V, 80ma). I am also considering a Champ PT (325-0-325, 70ma). I have a couple of questions on these PTs. Do I really need 120ma for only 2 tubes and VRM? Also, what modifications would be needed, if at all, using higher or lower voltage than 315-0-315? I have attached a schematic of the amp and the BBQ PT specs. For the OT, I am considering using the BBQ Single Ended Output Transformer, 5K : 2,4,8, and 16 which matches the specs on the SE amp. Please advise.
Thanks,
Dan
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Have a look at Edcor:
XPWR061: 300-0-300, 120mA
XPWR047: 330-0-330, 120mA
both reasonabley priced at $54 (unless the price has gone up recently)
Personally I'd go with 061, since I think 300-0-300 would be plenty with a SS rectifier.
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also: http://www.allenamps.com/parts.php (http://www.allenamps.com/parts.php)