For sale is a Knight Basic 60 (KG-85) that has been fully restored from the ground up. The performance of this amplifier is simply astonishing. Ample power to drive any set of medium or large high efficiency speakers with ease. The noise performance is also amazing, not a hint of hum or hiss is heard even with the volume cranked into high sensitivity speakers. Bass is huge yet balanced, mids are ultra sweet and highs are full of air yet are still accurate and crisp. The big bottle, clear top 6L6GC have a ton of air to the sound and the stereo imaging is second to none. Just an all around amazing performer at a fraction of what the equivalent Mcintosh amp sells for.
As can be seen, cosmetically the unit is in absolutely wonderful condition and did not require any actual cosmetic work. Just basic detailing and wiping down. This was a one owner unit that was cared for incredibly well. The metal cage did not come with this amp unfortunately.
The preamp tubes in the amp are a pair of matched gold pin Realistic 6267 (made in Germany) and the preamp tubes are a pair of matched gold pin Realistic 12AX7 (made in Japan). The power tubes are all double getter GE 6L6GC that have tons of life left in them (all tubes test 95% or above on our calibrated Hickok 539B).
Electronically, the amplifier has been completely refurbished from the ground up. Each board was removed and had every single resistor upgraded to metal film (metal oxide for the power supply) and every signal cap upgraded to modern high quality film! All electrolytic capacitors have been upgraded including upping the voltage and capacitance ratings in the power supply dramatically (after the internal choke, as to not cause the 5AR4 rectifiers to arc). Then the stock bias scheme was removed - it relies on running the power tube cathode current through vintage switching jacks and potentiometers and if those fail, you lose bias. So again, this bias scheme was removed and the cathode bias resistors are ran directly to ground, how they should be. The front current probe jacks are now hooked to 1 ohm resistors that tie each power tube to the bias resistor. Checking bias is as easy as inserting the included custom made probe into one of the four amp jacks and plugging the banana plugs into a volt meter. The millivolts that you read will be directly related to the plate plus screen current and should be around the 45-50mV range per tube. The balance pots still control balance for the phase inverter and can be tweaked for the lowest distortion, but mid point sounds great on both as well.
If there are any additional questions or notes required, we would be glad to facilitate. The amp is now ready to go for many years of daily enjoyment! It is truly plug and play ready to go!! We do highly recommend the use of a line conditioner or variac to run this amp at exactly 117V AC - this will provide the absolute longest tube life and best overall performance.
We will package and ship this amp incredibly carefully with all tubes removed and packaged for safety as well. We ship using FedEx or UPS with full insurance.