Its pre pre stage is a pentode 6au6 and input pentodes imho sound great. other than a 330uf cap right off the tube rec,of their original design(should be about 33-20uf) this preamp sounds outstanding, also with my choice of tubes.
#Ampkit feedback series#
Hello poster, i have built a few china kits (3), a 6v6 preamp, which with my choice of film caps, brand and type and a fix to the power supply, as is necessary on any china kit, as their power its 220 so they make a two coil primary power trans, in parallel 110, in series 220. (Some schematics are listing a 220V power transformer for international users, which usually means a 110V transformer will go to the US/Canada/Japan. It can be very difficult to trust that the power transformer is wired for 120V and not 110V. If you buy one of these inexpensive Chinese kits, I would budget plan to spend at least an additional $200-300 to get some proper transformers.
The bandwidth was also quite a bit poorer than specified. We measured 3W at 5% THD and 40W at 15% THD. The company said it would do 45W at 5% THD. I don't mean to be overly negative, but last week a friend of mine brought over a "well respected" built in China but designed/distributed in the US amplifier. This is going to cause a lot of problems. Several of the schematics linked show an ultralinear wired E元4 and no global feedback.
Anything more than that and distortion/bandwidth will be a problem. The size of the transformers should give decent frequency response at 2-3W. You might get 13W out of that amp, but it will be at 1kHz and very high THD (well over 20%).
The specifications looks like very, very typical Chinese lies.
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