Gretsch Twin Tremolo made by Valco.
This uses 2 6973 tubes for that led zep tone.
3 12ax7s and a 5u4. Original speakers 2 c12r Jensens.
Serviced new capacitors and 3 prong cord. All tubes are RCA.
Compared to a Supro 6424 the circuit is the same and so is the tone.
The bigger transformers, bigger rectifier tube,
dual speakers make for a slightly louder amp about 17 watts compared to 14 watts.