2. amps-preamps
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Preamp gain question

I am unable to turn up my CJ PV 10 pre amp up past 9 o"clock. Could the gain be lowered by using different tubes? I have considered using rca attenuators which are advertised to take it down by 10db but I am not sure if this is the way to go.
Also, I am using a Goldring 1042 mm cart (6.5mV output) Would going to a lo mc cart allow me to utilize more of the preamp gain control?

I guess I am trying to find out where my mismatch is occuring.

Everything sounds great but I have no control over low volumes.
zenblaster
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almarg
9,670 posts
 
I wanted to add the following sentence at the end of my previous post, but we don't seem to have an edit function on this forum (someone please let me know if there is a way of editing one's own posts):

A tube set for a preamp that would result in a 10 or 20db reduction in gain from the design's specifications is probably defective.
intactaudio
302 posts
 
The only thing I can suggest is to get a good feel for the proper gain structure you need and make system changes accordingly. From your last post you seem to be using something else for Phono, is this the case? Right now it seems you are adding about 30dB of gain with your pre only to attenuate around 50dB.

dave
zenblaster OP
504 posts
 
From your last post you seem to be using something else for Phono, is this the case?

I am using the phono stage of the CJpv10

Gain: phono stage 48.5dB
Gain: Line stage 31.5dB
Line stage 84 dB below 2.5 volt output
intactaudio
302 posts
 
can you use the phono stage without using the linestage? If so, you could get rid of 31dB of gain right there.

dave
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