I have a single ended triode par of monoblocks which I built because I can't afford to buy what fits my tastes. For my preampier I have always used a simple SET using either a 6J5, a 76, a 6P5, and finally Arcturis 27 because I like blue glass instead of clear glass and the 27 has a wonderful sound. I found an Alps volume control sounds more alive than the stepped attenuaters using the best metal foil resistors. They are easy to build and you can build the power supply in a separate chassis to keep stray transformer magnetic fields away from sensitive circuits. I have a 45 SET amplifier but I discovered Magnepan speakers which sound to me more like a live performance in the opera house than vastly more expensive and complicated cone speaker arrays with all their crossover and resistor, capacitor, inductor equalizer circuits to compensate for the back EMF electro-mechanical deviations in frequency response. But a 45 can't drive Magnepans. I ended up building a pair of 833A monoblock amplifier stages and replaced the output transformers on the 45 amplifiers with Lundahl LL2736 transformers the 600 Ohm outputs I connect between ground and the grids of the 833As which are very linear at 1000 anode Volts and zero grid bias Voltage (they draw about 115 ma.) I put the 833A amps on the floor next to the Magnepans and run thin Teflon insulated wires from the 350 plate Volt B+ out to the Lundahl 5k windings and back to the 45 anodes. This higher Voltage low signal current over the long distances from my 45 amp and preamp cabinet circumvents the dilemma of long speaker cables vs long interconnect cables and is insensitive to induced noise; it has all the virtues of high Voltage power-lines for cross country power transmission. Shielding and capacitance between wires is insignificant.
Even if I could afford the luxury of buying factory amps and preamps, I would lose the freedom of having exactly what want and prefer.
