Can tube rolling change bass?


Hi, I am curious if tube rolling can change bass performance? my pre amp is a juicymusic peach and my amp is a rotel 980 bx, my speakers are dyi 91db. thanks,Scott
52tiger

Showing 2 responses by cyclonicman

Totslly agree with Mapman. I have rolled more tubes than I care to remember and changes in bass are mostly subtle and could be considered a tweak. Deep bass is mostly derived from woofers and subwoofers and the equipment driving them, not from tubes.

Bob, got the Peach II's specs from enjoythemusic.com

Specifications
Type: Vacuum tube stereo preamplifier
Line Stage:
Gain: 16.7dB in Hi Mode; 16dB in Lo Mode; 0 dB in HT BYPASS
Frequency Response: 5Hz - 90kHz
Hum and Noise: -85dB
THD:0. 15% 20Hz - 20kHz ref. 2V out
Input impedance: 47k ohms
Output impedance: SuperLoZ Mode: 90 ohms; HiZ Mode: 3.5k ohms
Max Output: 30Vrms 47k ohms load

Inputs/Outputs:
AUX Inputs (high level):4 relay switched
Tape Loop: 1 in, 1 out with monitor switch
Main Output: 1 RCA

Tri-Mode Operation:
The Mode Switch on the front panel has 3 positions:
LO: This is the SuperLoZ Mode with an output impedance of 90 ohms. In this mode the 6H30 gain stage is connected to a compound 6922 buffer stage to create the very low impedance output needed by some Solid State power amplifiers. In this mode the Peach will easily drive a 5k ohms load, or an extra long cable run.
HI: This is the HiZ Mode with an output impedance of 3.5k ohms. This is the shortest, most elegant signal path using only the 6H30 Class A gain stage and one capacitor to the output of the preamp. This mode is intended to be used with amplifiers that have an input impedance > 100k ohms, such as typical tubed amplifiers. We often refer to this as "BlueBerry Mode" as this is the same line out as the BlueBerry Xtreme.
HT: This is the HT bypass mode, or Unity Gain mode. In this mode the HT INPUT is switched directly to the output jacks as a "straight wire" bypassing all internal Peach circuitry including the volume controls. If you connect the FRONT outputs of your HT pre/pro to these inputs, you can put the Peach in HT BYPASS and control your front amplifiers from the HT Pre/Pro, making it very easy to use a premium amplifier for the front channels of your HT system as well as your music system. NOTE: The Peach must be ON to use the HT mode.

Outputs: Stereo via RCA plus
Tube Compliment: one 12X4, two JAN Philips ECG 6922 and, one 6H30
Dimensions: 19 x 6 x 12 (WxHxD in inches)
Weight: 18 lbs.