Uploaded March 2017 | Updated September 2026, 17 hours ago
Hoping that this isn't the most boring movie on YouTube, The Hoofbag responds to a request to restore to original the PSU section of a Selmer Treble and Bass amplifier head. It would only be of interest to a person who owns one of these amps, or is particularly patient/curious. What we thought might be a simple job turns into a longer movie than we anticipated. At some point in its past this lovely old amplifier had its GZ34 rectifier replaced with a solid state type, probably for reasons of cost. There were two diode rectifiers in series with a 250 ohm resistor, in place of the valve rec. It is said that the simulated crocodile skin versions of this amp have more bite. (!) We also noted that the power transformer had been changed. This is the second Selmer Treble and Bass amp that I've had to change the mains transformer in, so it might actually be a common fault with this model. The renewed transformer, supplied by UK component distributor Radio Spares, is a bit bigger than the one it replaces so it will probably last longer. The title which includes 'reach around' is due to the fact that we had to turn the chassis over a few times to make the GZ34 heater connections. We hope the movie will be of some use to another engineer, taking on a similar project. Many thanks to Shrubbie Leaf for doing all the video editing, n that.Innit!
Hoping that this isn't the most boring movie on YouTube, The Hoofbag responds to a request to restore to original the PSU section of a Selmer Treble and Bass amplifier head. It would only be of interest to a person who owns one of these amps, or is particularly patient/curious. What we thought might be a simple job turns into a longer movie than we anticipated. At some point in its past this lovely old amplifier had its GZ34 rectifier replaced with a solid state type, probably for reasons of cost. There were two diode rectifiers in series with a 250 ohm resistor, in place of the valve rec. It is said that the simulated crocodile skin versions of this amp have more bite. (!) We also noted that the power transformer had been changed. This is the second Selmer Treble and Bass amp that I've had to change the mains transformer in, so it might actually be a common fault with this model. The renewed transformer, supplied by UK component distributor Radio Spares, is a bit bigger than the one it replaces so it will probably last longer. The title which includes 'reach around' is due to the fact that we had to turn the chassis over a few times to make the GZ34 heater connections. We hope the movie will be of some use to another engineer, taking on a similar project. Many thanks to Shrubbie Leaf for doing all the video editing, n that.Innit!
