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

Showing 16 responses by sabai

Sherod and Scifi,

I have contacted Joseph Chow about the tubed power supply grade. I will report back here -- hoping to have a positive outcome soon.
Sherod and Scifi,

Sorry about the typos. My previous post should have read:

I have contacted Joseph Chow about the tube power supply upgrade. I will report back here -- hoping to have a positive outcome soon.
Gammajo,

That's interesting. I tried a pair of Siemens Cca and they did not work for me in positions 1 and 3. I am now using a pair of Philips SQ in positions 1 and 3 and they are very good. I have other tubes coming to compare.
I recently purchased the TP 2.3 preamp. I had some Siemens Cca ready to roll. I was surprised with the results. The synergy was not working with my system. I have had good success with Amperex 6922 and Philips SQ -- rotating between 1 to 3 and 2 to 4 -- while I await the delivery of other tubes. The TP 2.3 is starting to sound like the great amp others have written about on this thread.

Regarding tube rolling, I have read of success with Amperex PQ White Labels. I have been in touch with Joseph Chow who has suggested I try Telefunken (I assume E88CC) in 1 and 3 and Mullard CV2492 (preferred) or Amperex (not yet specified) on 2 and 4. Does anyone have experience with this? Thanks for any helpful suggestions.
Mjm6,

IMO all 4 positions are crucial. I did not realize how true this was before installing the E188CC in 2 and 4.
Anyone have experience with Amperex, Telefunken, Mullard or other brands with the TP 2.3?
Scifi,

Is this an external power supply? I have the 2.3 with all the trimmings that are advertised on Joseph's site but I don't recall reading about this specifically.

Sherod,

What were the improvements with this new fuse?
I made some cable changes recently -- added David Elrod. Now the Siemens Cca are the perfect pair in positions 1 and 3.

A while back Gammajo mentioned loading the TP with bookends. For years I have done bottom loading of all components and speakers with sand boxes -- Tupperware-style containers filled with dry beach sand. I just tried top loading the TP with a single container (about 5 lbs. of sand). The sound seems to improve. Two containers make the sound diffuse. I just tried top loading my transport. Seems like more improvement. Has anyone else tried loading with their TP system?
Tom, thanks for your kind offer but I will pass. I have tried a zillion tubes here including some of the top-rated Russians. None even come close to the E188CC. You should try a pair if you can.
Scifi,

There are 2 kinds. You want the A-frame version only. There is a current listing on Ebay. If you Google Ebay Siemens E188CC A-frame the first item is what you are looking for.
Mjm6,

IMO all 4 positions are crucial. I did not realize how true this was before installing the E188CC in 2 and 4.
Mjm6,

IMO all 4 positions are crucial. I did not realize how true this was before installing the E188CC in 2 and 4.