Crescendo Mark VI Custom Vacuum Tube Preamplifier - Inspected

Selling to organize audio equipment.
Inspected before listing.
There is some crackling in the VR, which was noticed during use.
This is the final vacuum tube pre-model from Heathkit. Unfortunately, from serial number 7 onwards,
they were changed to transistors.

A tube stereo preamplifier kit designed by Hideya Masutani over 3 years, starting from the Mark V.

The equalizer stage employs the same P-K feedback method as the McIntosh C-22, and further pursues simplicity by removing parts that are thought to degrade sound quality.

Instead of general tone controls, it is equipped with a loudness boost circuit.
This circuit boosts only the desired frequencies while gently cutting off ultra-low frequencies that are thought to degrade sound quality.
I replaced the four ECC83 tubes I had with Telefunkens. The sound quality
has drastically changed, becoming even more like the McIntosh C-22. Sound quality is subjective.
Since you can easily change the vacuum tubes, you might enjoy
finding your preferred sound by using Mullard, Siemens vintage tubes, or JJ tubes.
The unit is in good working order, but will be sold as-is upon arrival, including any damage that may occur during shipping. Thank you for your understanding.