Audio Horizons TP 2.0 Preamplifier


Anyone famaliar with the manufacturer,and in particular
this pre amp.The credentials and testimonials seem
impressive.The advertised 10 day audition is appealing.
markwatkiss
La45,
According to Victor, the new wiring harness has a lot to do with the looooong break in.
For the technically-minded, the new output caps in the TP 2.1 upgrade are 1uf value. These are bypassed with a .22uf Solen cap to tame down the highs a bit. The TP 2.0n had a 4.7uf Hovland. I find this interesting as this value difference might make a difference in matching to input impedances of certain amps. Perhaps Victor will expound on this.
I use balanced in and outs on my 2.1 upgraded preamp. I understand in my version Joseph puts some more money into the XLR jacks. I think he builds in some sort of balanced transformer in each channel. I have to check on that. I also noticed a nice improvement using the XLR's as I also own AH RCA IC's.

That wire harness is long from the front of the unit to the back. The new chasis 2.1 has a much shorter cable as the volume knob is connected to a rod which reaches far back into the unit.

I may try my NOS Mullards tonight!

Bill
Post removed 
Grant,
My upgraded preamp just passed the 120 hour mark. Yes, the voices do seem to appear to be still slightly recessed. The highs are also a bit softer,i.e. cymbals and bells are a tad soft. I used the word subdued with Victor and he calls it soft(You call it "to-ma-to", I call it "to-mah-to"). The soundstage seems to be wider, yet not deeper( overall much larger than life to me). I am going to give it through the weekend and by then, if I'm not satisfied, I'm going to talk with Victor or Joseph to see if I can semi-revert back to the original TP 2.0n version. I have tried many different versions and value sizes of output caps in my previous TP 2.0n version and Joseph said that when he upgraded my preamp he had to repair some traces on the board that had rubbed off somewhat( from all the cap changes I made). Victor "strongly" urged me not to experiment with cap replacements anymore. Still, at this juncture, my ears are missing the "breath of life" sound that the Hovlands were giving me, in spite of Victor's opinion that the Hovlands sound a little compressed and veiled in comparison to the new caps. Since Joseph doesn't give an itemization of all what changes he makes( only a generalization), I'm wondering if my older Hovlands would still be a drop-in replacement for the new output caps. Victor told me that the Hovlands would work in the new unit, but hasn't responded to a follow-up e-mail where I asked him to confirm with Joseph about the Hovlands being a drop-in replacement) You might want to consider communicating with me privately from here on so as not to ruffle some feathers here on this thread.