I heard that the V72 has an artificial rise in the highest frequencies, which the V76 hasn't. The historic V72 (IRT) was spec’ed from 40 to 15k Hz +0/-0.5dB; the historic V72S (only 300 or so made) is same as the V76S, 20 to 20k Hz. There are several different V76 version from 80/120/M/fr about 40 to 10k or 15k and T (5Hz to 100k Hz). Even the V76 is from a technical point two cascaded V72, were input x-former has the same disk winding technique but 1 to 30 ratio vs. V72 1 to 10, and V78 1 to 20, the sounds quite differs, were V72 is quite clear with a good low end, the V76 is quite dark with a killer low end. The V78 hangs somewhere in between. All proper historic working units should not have a rise at all. Most home fixer upper V units, were someone just remove the frequency filters have a rise at about 8k to 12k with 6 to 8 dB on octave, depending on the revision (there are about 10 revisions in x-former); also compromising the S/N ratio. In most cases if a hard 48V supply is installed the x-former gets pre biased (and you destroy the input x-former over time) so you lose everything below 300Hz, so there is a quasi artificial high end rise. All historic tube V series modules need a ramped (5 sec.) 48V supply in order to work and work proper for a long time. The new V78M is based upon the same x-former we use in the V72S (identical in winding, core material to the historic V72S with changes in insulation material to insure a longer life), like the historic V72S no frequency filters are need, but with a few minor changes in circuit tree, to offer a wide sweep from classic V sound to modern colored sound. In -60 dB (input sensitivity/impedance selector disconnected) the unit holds up to a proper rebuild V78. If you looking for a V76 you need to get a V76, if you looking for a V72S you need a V72S, even the differences are subtle... Hope that helps you, Best regards, Oliver

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