V.T.V. Issue 20, watch out the next time you go tube rolling, make sure those huge differences you are hearing are based on legitimate tubes. How mortifying to find the NOS is FAX. It was only a matter of time. Now we need a nice circuit for those cheap compactrons. Or we could go solid state; put some passive components inline with the speaker and say it sounds like tubes! Shades of Bob Carver and the famous nulling circuit.
Actually the V.T.V. article is extensive and it would be hard to summarize in a short space but they describe them, do the load lines for some, and suggest uses for them in circuits. It's an interesting and informative article; worth the price of admission. The Bob Carver nulling circuit originated when Bob Carver of Carver Electronics;(he no longer has any relationship with the company is the last info I have,), decided the whole tube revolution was hype, that tube circuits were nothing but tone controls and that he could devise a circuit that would enable a SS amp to sound exactly like a tube amp with the cooresponding tube response. He installed this circuit in a SS amp and provided an adjustment access from outside the chassis so the owner could have that"Tube Sound". It was supposed to introduce so-called tube distortions and non-linearities that would mimic the typical tube response. Then you could turn a screw and adjust and cancel anything not seen in the original signal; ie. "Null" the output to zero distortion to return to SS mode. That was his proof that tubes degraded the sound. I don't have a schematic so I don't know how he accomplished this. I was present at a demonstration of this innovation back in the 80's.
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