• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Newbie looking for some advice on mods and tubes for Cayin TA-30


2008-01-08 3:55 am
Hello world,

I have just entered the world of tubes by way of an used, but not abused, un-modified Cayin TA-30.

I have done a fair bit of googling and searched on various forums, but have not yet found anything with any level of detail that I feel comfortable with. I have basic electronic and soldering skills and knowledge and was hoping for a bit of hand-holding in my first foray into modding.

I am wondering if there if anyone knows of any sites or other resources that will walk a newbie through some simple modifications to the TA-30 ?

I gather that the switching out 4 of the capacitors for Auricaps and upgrading a power cap is a fairly good place to start. I assume that I just look at the current cap values and get same values for the replacements. Any advantage to using other values ? Any recommendations for parts to use ?

Looking at rolling some tubes. I have just installed a complete set of new tubes - matched quad of JJ KT77 + matched pair of JJ ECC803S (12AX7) + matched pair of JJ ECC82 (12AU7) - to replace the original (EL34 + 12AU7 & 12AX7) tubes. The resulting sound is way too bright, with very little bass. I have had them powered up for about 5 hours now and I am wondering if this is a bad combination or if I simply have to let them break in for a while yet?