Very nice work; congrats on your preamp. I have a Carver C-2 that is in perfect shape; the one single issue I have with it is it's very high gain on the phono stage (MM=35 dB, MC=53dB). When coupled with my UPA-1s at 32 dB and my speakers sensitivity of 95 dB I hear some ground noise when there is no sound. I always wondered if anyone did something similar to your project for the C2; I'll keep looking.
My experience is that not only do 1% tolerance metal-film resistors sound better and quieter, but that further gains are readily available by increasing the wattage rating of the resistors. Particularly in tube equipment, I always increase the wattage rating of all resistors (space permitting).
Additionally, I find that both reliability and sound quality increase by upping the voltage rating on replacement capacitors. For example, if the original was a 400-V rated cap, I always (space permitting) replace with a 600-V model.
I also like to increase the capacitance values on all power supply caps where space permits.
These changes make for a more crowded circuit board, but also result in audible improvements, IMHO.
The Carver is a fine looking mod, by the way. Congratulations!
Replacing resistors with chokes in the power supply in tube equipment can also give you good results.
USP - 1 ERC -2 UMC - 1 XDA - 1 UPA - 1 x2 UPA - 5 Grant Fidelity - B - 283 MKll CV181 - Shuguang APC S 15 power conditioner Music Hall 5.1 Goldring 2300 Panasonic TH - 50 PZ800U Panasonic DMP - BD - 55 X - series cables NHT - 1.3 (modded) VT-1 Centre Super Zero`s rear and side NHT - SA - 2 sub Logitech Harmony One + Squeezebox Touch Sennheiser HD - 600 - 126 Bottlehead Crack OT
My C1 still needs blue lights and a full refurb update, or I should set it free, le sigh... I love the design of the the inpuT selector on the C1. Proper knob selection with clear 'thunk" into place. And the DUAL seperate MC and MM inputs are what I wish the USP-1 had**. I still run cassettes and reel to reel so also a huge fan of the way the C1 has the tape selection/dubbing controls setup.
**But it soon will have that upgrade with XPS-1 little phono stage unit I suppose.
XPA-200 USP-1 ADSL990's/Magneplanar MMG's Carver C1 Pre Denon AVR-2801 Sources: Itunes on MAC - Jriver PC TT - Lovely Oak - 1950's Rek-O-Kut Rondine Jr L-34 w/JICO SAS M55E TT - Dual 1257 as my ROK has no 45 RPM Reel to Reel - Teac A-3340 Alesis - Masterlink Alesis ADATs 20/48's Various forms of mid END DAC/ADC/soundcards/digital mixers
Please let me know how the XPS-1 phono stage compares to the stock C-1 phono stage. I don't recall how the phono stage sounded before I upgraded the op amp and the ceramic caps to polystyrene, but I can say that it sounds very good and very quiet after those upgrades.
Last Edit: Dec 28, 2012 20:31:16 GMT -5 by RPA-1 man
Post by Cory Cooper on Dec 29, 2012 1:27:52 GMT -5
Wow...very nice work there.
I actually still have a Carver C-1 that I bought new back in the day. I also had a M-1.5t amp that I sold about 20 years ago. In addition, I still have a Digital Time Lens that I bought new as well. I always loved the C-1.
Maybe I will unbox it again someday and setup a two-channel system in another room with it.