Finally, I've tried S&B TX102 TVC with a GC amp

[Cappy]

Just an FYI for people - John at Bent Audio is moving from Seiden to Shallco for his volume controls.

With the dollar crash, the Japanese controls got too expensive and he likes the Shallcos too. He is modifying the spring action so they are easier to turn.

I'll be ordering the Shallcos for my TVC preamp.

Bill

 

[Raj1]

Hi,

I've also been fortunate enough to aquire a passive linestage using the s&b tvc's. My previous passive was a l-pad shunt attenuator with precision 0.1% resistors. The s&b is streets ahead in performance, and other than overall cost, I can't find a single sonic area where the resistive attenuator wins. Overall perhaps a 25% improvement in sound qulaity and listening experience right thru the audio band.

Thanks
Raja

 

[Pan]

Raja,

can you tell more about your shunt attenuator...?

Like, what amp input impedance, values of resistors (typicall setting) in the att. Type of outputstage in the source... current capabilities and output impedance.

/Peter

 

[Raj1]

hi Pan,

The shunt attenuator is 10k impedence the resistors used were welwyn rc55y's, my power amp has a 47k input impedence and a gain of around 21db, and I was using a slightly modified pioneer pd-s801 for cd source. The difference is great, especially at lower volume levels......

I'll soon have my favoured output stage fitted to the above cd player which has a z-out of around 100ohms.
I've also tried my wna buffer after the attenuator, it can drive down to about 10ohms, and runs in class a and has a 47k input impedence. It does offer some advantages over the standalone resistive attenuator setup, but cannot match the sound quality of the tvc on it's own..

Thanks
Raja

 

[frejo]

http://home.swipnet.se/~w-50719/hifi/qrp02/data_qrp02.html

Any idea if/how good this kind of prestage will work with this GC:

http://home.swipnet.se/~w-50719/hifi/qrp02/data_qrp02.html

Any help appreciated, going for the GP on the TX102 if you think this combo is a good idea.

Thanks in advance
Fredrik

 

[Pan]

Thanks Raja.

One thing you could try when the new stage is in place in the CDP is to run a 1k two elements fixed voltage divider to see how a low impedance ultimate resistor fix compares to the TVC.

/Peter