For those who know and love the Philips high impedance speakers from the 50s and 60s, know (but may  not love their el86 push-pull amps), this is a SE Class A otl alternative. This simple but wonderful sounding amplifier can easily drive Philips speakers, either their 400 or 800 ohm drivers to 6-8watts, more than enough for a small living room, large bedroom, study or den to high levels without distortion. As an alternative for the Philips amp and other otl amplifiers this amp is unique. It is: 
  1. Single ended (no crossover distortions from push-pull tube designs), class A;
  2. cap coupled (Jensen paper in oil) caps, and
  3. Jensen (pio) output capacitors with
  4. interior signal wire is silver;
  5. 100% copper (Eichmann cable pod) connectors and
  6. Vampire RCA inputs (replaceable with another brand if you don't like Vampire).
  7. the amp tubes are 12bz7 and 6s41. Both tubes are readily available and inexpensive. 
The sound is rich, direct, refined and immediate (no output transformer distortions), with an abundance of Philips high impedance, high efficiency drivers available, (we can also build these into speakers for you if you wish), this may be the last amp you may ever need to buy.

Frequency response 30hz -20k+hz