Wurlitzer 3660 w/ 533 amp

[TCW]

A friend of mine asked me to have a look at his 3660. It set to free play (using the factory sw) and the selector solenoid doesn't energize so I will have to have a closer look at that.

It has two base speakers and two higher range speakers in the top. The right upper higher range speaker is out. Being that the 533 amp is a transistor unit, is it likely a bad transistor or something at the splitter? I intend to replace them and the caps regardless but I understand these are hard to decipher modern replacements?

I can only read one of the four mounted on the heat sink:

466
125703-3
7217

S is the 125703 NTE Equivalent NTE121, 2N2526

I found the following suggested replacements at www.flippers.com/wurlxref.html Even they are now obsolete. I appreciate any help in the modern selections. - Tom


I also see Q6-7, mid stage, 138789-5 = 2N3391

I also see Q8-9, mid stage, 136406 = 2N6111 or TIP42 or MJE371

Q1-2 early stage138789-5 = 2N3391

Q3-4 early stage 138789-4 = 2N3393

Q5 early stage 131262 = 2N4916


Standard Part Numbers for Semiconductors With Wurlitzer Part Numbers

Wurlitzer Part No. Description Std. Part No.

71588-21 3 A Diode 1N4142

76700-23 1 A Diode 1N4004

125703 Power Transistor 2N2526

128449..................Zener Diode 1N4758

130537-4-5 Transistor 2N2926-4-5

131262 Transistor 2N4916

131777 Transistor 2N6111 or TIP42 or MJE371

132650 Transistor 2N4870 or 2N4871

135789-1................Transistor 2N2222 or ECG123

136406 Transistor See 131777

137480 (TIS-92) Transistor MPSA05

138789-1-2 Transistor 2N2926-1-2 or 2N2925

138789-3 Transistor 2N3394

138789-4 Transistor 2N3393 or ECG194

138789-5 Transistor 2N3391 or ECG199(?)

140612..................Transistor 2N5882 or 2N3716 or ECG181 (this one is good!)

140622 Transistor 2N2919 (dual transistor) note a 2N2222A or PN2222A should work

140623 Transistor MPSA56

140624 Transistor MPSA06

140625 Transistor 2N6107

140626 Transistor 2N5496

140627 Zener Diode 1N5240

140770..................Triac TIC236 or SCI46B or 2N6342A

142138 Voltage Regulator LM340

143476 Zener Diode 1N4736

131710 Transistor 2N4248

131782 Transistor 2N5086

138378 Transistor MPSA05

138380 Transistor TIP31A

[jukenorman]

Hi Tom,
I suspect you may be over-complicating the problem! The 12" speakers are full range and not bass speakers. The 6" speakers are limited to higher frequencies by series capacitors (8uF). If you have no sound from only one of the 6" speakers, the isuue is likely to be either the speaker itself, the capacitor or possibly wiring/poor connection.

Norman.