The 1391 amp was the low end of the super cool 'Phase
3' of the Silvertone 50s amplifiers. 5 watts output, volume, tone, two inputs.
Frequency response... well, it had one; rated 100-9000Hz.
Danelectro was smart, they didn't change the innards to the amps a lot,
but their designers kept the outer styling moving along with the times.
Introduced:
Fall/Winter 1957 at $37.95
as the 57D01391L
Through its career, it was :
57H01391L
57G01391L
Retired:
Spring/Summer 1959 at $37.95
as the 57Y01391L