1966 Supro s6420 Thunderbolt

Marsoni

M251S

$900.00

Get it in 3 business days with 1 day shipping. Friday, May 29

1966 Supro s6420 ThunderboltFor your consideration, Garrett Park Guitars presents this 1966 Supro s6420 Thunderbolt Amplifier. This s6420 was one of the last few made before Supro discontinued the line. As such, this amp features a more solidly braced baffle and a solid state rectifier that Supro used to replace the 5U4 tube used in earlier models, effectively tightening up the low end on the amp. The amp itself is in original condition save for a replaced 3 prong power cord and

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High Quality RCA. I needed a 1 Male to 2 Female RCA Y adapter, and me not reading correctly ordered this. However - I managed to make this work at my AMP instead of the head unit. Great sound quality, Cable is a good gauge and matches my RCA's already ran in the car. Connects easy and had this installed within minutes. Thanks Skar!

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Reviewed in the United States on October 11, 2025

Verified Purchase

Phillip Morris

Carnegie, US

★★★★★ 5

Works as intended.

Size: 2 Channel-3 ft

Needed a short cable to run from stereo to pac-1 level knob. Works as it should.

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Reviewed in the United States on March 13, 2026

Verified Purchase