The only true difference between 140-series and 145-series Wurlitzers is the amplifier. Both keyboards were released in the 1960s and represented a total redesign of the Wurlitzer electronic piano. Wurlitzer overhauled the mechanical action, revised the cabinet, and — for the first and only time — manufactured two parallel styles of amplifier: a solid state amp (the 140/140a/140b) and a tube amp (the 145).

A customer brought this Rhodes in for restoration. It had been in storage for some time, and he asked us to bring it back to optimal playing condition.

The instrument was out of tune, missing most of its tolex, and suffered from a sloppy, unresponsive action. It had clearly been well-used for a while, and then at some point it had been put away and not used at all. Overall, though, it was in good shape, because all of its fundamental parts were present and more or less functional. That is, the wood parts weren’t warped, the plastic parts hadn’t deteriorated, and nearly every pickup worked. It was a great candidate for restoration.

The 206a is the student-model Wurlitzer. It shares all the same cosmetic features of its professional counterparts, except - appropriate for the classroom - everything about it is just a little less exciting. Instead of dramatic black, here we have friendly beige. Instead of four speakers, we have two. Instead of vibrato, we have the self/ensemble knob.

These photos are from a batch of four student model Wurlitzers that we recently picked up. All arrived in amazing condition, with very few rips or scuffs and immaculately clean interiors. With just a little restoration, they became excellent and highly playable examples of early 200 Wurlitzers. Only one is still available.

Originally, Wurlitzer built amplifier chassis just big enough to fit the components they needed. This left some interior cabinet space unused. There is nothing wrong with this design choice, but there is a lot of interior cabinet space that can be utilized should one (like, say, us) were to design a brand new replacement amplifier to go inside the Wurlitzer.

Whenever you think about modifying a vintage electronic piano, you should think about two things. Is the mod reversible? And, if not, am I actually improving the keyboard?

A Wurlitzer electronic piano has been around for decades. Clearly, Wurlitzer did something right when they manufactured them, because even after all these years they are still desirable. It is important to avoid performing impulsive mods that will irreversibly change the keyboard. Think it through. Consider whether the mod enhances the function of the keyboard. Consider whether there is a less invasive way to reach the same goal.

When we’re thinking about buying a Rhodes, there are a few criteria that we use to judge potential purchases. We’re mostly concerned about how much work the Rhodes needs to become playable - and if you want your Rhodes to be a functional keyboard and not just a moderately inconvenient buffet table, you probably care about the same things we do.

In Part I of our guide on fixing hum, we listed some easy fixes. In Part II, we’ll go into further detail on techniques that require some prior electronics experience to execute. It’s worth checking out Part I first, because it listed some simple, non-invasive things that you should always be tried before diving into the amplifier’s circuitry. For the purposes of this article, we’ll assume that you already tried everything in Part I. This includes:

Before we start, a disclaimer: hum should be addressed on a case-by-case basis, because every vintage amp is special and degrades in its own way. What cures one amp may not work for another. That said, reading this guide should give you a good starting point on how to address your own hum problems. This guide is pretty basic and going to assume that the only piece of test equipment that you have is a multimeter.

An effects loop opens up many, many tonal possibilities in your Wurlitzer. Some of the earlier Wurlitzers have a reputation as a one-trick pony. The 112, for instance. How many people on forums have opined that it’s good for that one Ray Charles sound, and that’s it? Three people? Four? That’s not the point. The point is that, once you give the 112 an fx loop, it now has an unlimited amount of sounds.

But what sounds, specifically, should you plug into your Wurlitzer’s effects loop?

This Wurlitzer 214 that we once had is a classic example of 214 glory. The Avocado green top was in excellent condition and the tolex was all there without any tears. The wooden keybed has some “chair” nicks and the grill cloth had some stains, but no tears! Perhaps the most amazing feature of the 214 is that it is a complete 200 set on top of a console which houses four 8” round speakers. The four speakers - two in front and two in the back - project the Wurlitzer’s awesome tone in all directions!

This Wurlitzer 120 arrived in exceptional condition. It had spent many years studio, a carpeted, finished basement housing an enormous collection of jazz records. Really the only indication that this keyboard is a late-50s vintage is the splatter-paint finish. It doesn’t show any of the cosmetic wear that you’d expect from a 60-year-old piece of gear. There’s a little bit of dust in the cheek block tolex, a little bit of patina on the metal parts, and that’s it.

When we walked into the room where the original owner had this keyboard, the seller mentioned they had it switched on for us ready to try out. We thought, oh then it must not be making sound because we heard nothing - not even the usual idle hum. We played a A-7 chord, and a wall of rich tube sound blasted out of the massive 12” alnico speaker. Needless to say, we were floored.

This is a classic example of a Wurlitzer 112a that we once had. We photographed it in our main studio live room. A serviced Wurlitzer 112a electronic piano is a powerful music making tool in any studio! The effective alnico speaker is mounted on the rear of the instrument so it can be easily mic’d without picking up much (or any) mechanical key or finger noise from the players’ hands.

This Wurlitzer 145 was brought in by a customer, who had just purchased it from its original owner. The Wurlitzer was in a state of obvious neglect: the amp was noisy, the keys were sticky, and the entire unit was covered in a film of dust. It had been refinished many years ago and had developed an interesting patina, but it needed to be handled gently because the old paint was prone to chipping. The 145 is a rare model of Wurlitzer and this one in particular was truly one-of-a-kind. We were very happy to work on it.

Fender Rhodes keyboards came with quite a few parts and accessories, many of which are subtle and easy to lose. If you’re unfamiliar with the Rhodes, it can be hard to tell if a keyboard you’re thinking about buying is complete or not.

This Wurlitzer 140a belonged to a producer for many years, and arrived at our shop in well-used condition. By that, we mean that it was pretty banged up and showed evidence of previous repairs. Also, because multiple latches were missing, the lid didn’t attach very well. At some point, it had obviously once been held in place with duct tape.

We received a pair of two optigans!

We’ve been interested in optigans for a while, but we never tried to acquire one because their maze-like construction makes them notoriously hard to service. Also, we don’t really do motors around here. But the opportunity arose to pick up two, so here we are.

All Wurlitzer electronic pianos - from the model 112 to the Wurlitzer 200a - are more or less built the same. There are subtle differences in the mechanical action and the amplifier, but they all follow the same basic principles.

When you hit a key on the Wurlitzer electronic piano, a felt-tipped hammer rises and strikes a metal reed. The reed vibrates to a certain pitch, which is determined by the weight of a lump of solder at the end of the reed. A pickup converts the vibration into an electrical signal, which is finally amplified by the onboard amp and sent to a speaker.

Here’s how it works in a little more detail:

The Wurlitzer 206 is the student version of the Wurlitzer 200. It is equivalent to the 200 in every day, but it is mounted on a cabinet instead of legs and some features of the amplifier are disabled. However, all of the components that are in a 200 are also present on the circuit board of the 206. Enabling vibrato and the aux output is therefore as simple as adding some wires and a 10k potentiometer. Here is how we do it.