To the right of the large power supply caps are four diodes creating a bridge rectifier. Again, given its quality I see no need to mess with it. Its rated for high output current with very low harmonic and cross-over distortion. The main output device is a 5-pin TDA2030 14W hi-fi audio amplifier. Given their provenance I'm leaving these alone. These chips are well-known in the guitar industry and are frequently used in effect pedals. Three JRC 4558D " high performance monolithic dual op amps" are visible. A pair of carbon composites are used in the power supply. The resistors all look to be good quality and look to be 5% carbon films.
#VOX AMPLIFIERS USA SERIES#
The electrolytics are all Sanwha SGs listed as "Standard series for general purposes, high performance and high reliability". To round things out are four green 224J (.22 5%) film caps in various places. The power supply holds a pair of 2200uf 35V and a pair of 220uf 25V. There are 8 small polarized electrolytic capacitors (.47 to 47uf) on the board. So I took it apart for an assessment and to see what could be modded. I was pleased to read online that over the years this little amp with 8" speaker has achieved somewhat of a cult status (!) There were quite a few reviews praising the sound quality of the amp, as though VOX engineered a bit of magic into it somehow.īut after nearly two decades of sitting idle I suspected that the electrolytic capacitors I remembered my VOX amp in storage and pulled it out of the closet.
I'd been playing strictly acoustic for years and the idea of a hollow body electric to play some jazz improvs suddenly appealed to me. This original V9158 has no reverb.įast-forward to 2017: Out of the blue I got the bug to buy an electric guitar. Incidentally, VOX only produced this until about 2001 when it was upgraded to the V9158R, a model that included a spring action reverb circuit. But after a while I moved on to another project and this amp ended up in storage. It was perfect for my needs: 15W transistor output, small size, and a nice vintage look. At the time I was experimenting with a Dean Markley acoustic pickup and DOD Chorus pedal. I bought this amplifier new in 1999 to pair with a 12-string Seagull acoustic guitar.
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