okay. Like most of the TR-1 parts, it was probably the
smallest speaker Jensen made at the time.
I decided to restore it just so I could hear how it
sounded. A schematic of the TR-1 is shown in Figure 3
with the four electrolytic capacitors highlighted (more on
this later); the chassis of my unit is shown in Figure 4.
A Regency TR-1 in average condition usually sells for
several hundred dollars on auction sites. A rare
pearlescent blue unit sold in 2000 for $3,200. None are
really expected to operate, only to ‘show’ in collections.
My unit — perhaps one of the oldest transistor radios in
the world (based on the low 2076 serial number) —
required careful handling. I expected all four electrolytic
capacitors to be open or shorted. What I found (in
addition to that) was one shorted transistor and an open
primary on the output transformer.
Obviously, a “parts” unit was needed to proceed.
After watching auction sites for a few months, I bought
one unit with a badly broken case, and also a bare chassis
with a few missing parts (Figure 5).
By Joe Bidwell To post comments on this article and find any associated files and/or downloads,
go to www.nutsvolts.com/magazine/issue/2017/05.
May 2017 43
FIGURE 3. Schematic of the TR-1.
FIGURE 4. The chassis of this unit.
FIGURE 5. The ‘parts’ units.