ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

previous: Tom Anybody out there how the TS9 r... -- 7/8/1997 10:03 AM

Re: TS9 reissues.

8/20/1997 7:53 AM
R..G.	Re: TS9 reissues. There is a fairly wide variance in sound in these boxes, depending on the component tolerances. The notable ones are the .22uf tantalum capacitors in the lowpass filter, but there are others as well. I recommend replacing the tantalums with film caps for this reason. This has a lot to do with the variances between units, even with the same schematic. The other variations are in the dual opamp. Vintage enthusiasts will insist on a "JRC4558D" as in the original TS808 and TS9, but some of the folks that have built or modified this circuit tell me that you get excellent tone from some more modern opamps, notably the LM833 and some of the CMOS dual opamps.

8/20/1997 7:53 AM

R..G.

Re: TS9 reissues.

There is a fairly wide variance in sound in these boxes, depending on the component tolerances. The notable ones are the .22uf tantalum capacitors in the lowpass filter, but there are others as well.

I recommend replacing the tantalums with film caps for this reason. This has a lot to do with the variances between units, even with the same schematic.

The other variations are in the dual opamp. Vintage enthusiasts will insist on a "JRC4558D" as in the original TS808 and TS9, but some of the folks that have built or modified this circuit tell me that you get excellent tone from some more modern opamps, notably the LM833 and some of the CMOS dual opamps.

Replies:

Tom Herpich RC, I found an RC 4558P in a fried ... -- 8/24/1997 7:21 AM