The following pictures are from Ebay and not mine. These will be taken off this blog if advised by the Owner of the pics:
The following are some pictures of my Jester Oahu JU-28:
Saturday, January 31, 2009
The Jester Oahu JU-28 Amp Inspiration: 50's Valco Oahu Amp
I came across a 50's Valco Oahu Amp ad in Ebay. This 50's amp is obviously the model that Jester Enterprises used as basis for the Jester Oahu JU-28 Amp.
The following pictures are from Ebay and not mine. These will be taken off this blog if advised by the Owner of the pics:
The following pictures are from Ebay and not mine. These will be taken off this blog if advised by the Owner of the pics:
Fender Showman 1966
Fender Blackface Showman 1966
Serial No. A 07348
This is one of two 1966 Fender Showman amps I have. This is the first one of the two that I restored.
It still has all original transformers. The power transformer is multi-voltage which is always a plus factor in these amps.
I used Sprague Atoms for the big Filter caps in the doghouse and for the Bias power supply to ensure safe operation of the amp and to protect the transformers and tubes.
I intentionally kept the original electrolytic cathode bypass caps in the board. I wanted this amp to retain its originality as much as practicable and as safety allows. The only part in the board that was replaced was the Light Dependent Resistor (LDA). This is required for the tremolo to work.
Serial No. A 07348
This is one of two 1966 Fender Showman amps I have. This is the first one of the two that I restored.
It still has all original transformers. The power transformer is multi-voltage which is always a plus factor in these amps.
I used Sprague Atoms for the big Filter caps in the doghouse and for the Bias power supply to ensure safe operation of the amp and to protect the transformers and tubes.
I intentionally kept the original electrolytic cathode bypass caps in the board. I wanted this amp to retain its originality as much as practicable and as safety allows. The only part in the board that was replaced was the Light Dependent Resistor (LDA). This is required for the tremolo to work.
Thursday, January 15, 2009
Fender Silverface Dual Showman Reverb 1968
Fender Silverface Dual Showman Reverb 1968
Serial No. A12705
The Dual Showman Reverb Amp is the "head amp" version of the Fender Twin Reverb. It has exactly the same chassis, circuitry and parts (for contemporary models of these 2 amp) but in a more manageable size and weight package (head amp cabinet). That said, the heft of the head unit is still quite substantial, obviously due to the substantially oversized power and output transformers.
IMO, the relatively big and heavy power and output transformers together with the solid state rectifier in these amps are the main factors that contribute to the well-known fender clean tone. The power supply can take large transient/spike load hit (power chording) without or with very little sag. The big iron core in the output transformer just couldn't get saturated that easily either. Result? Fender clean tone for days!
My particular amp says "Showman Reverb Amp TFL5000D" in the faceplate instead of "Dual Showman Reverb TFL5000D". It has the transition "cloth wire" and not the irradiated Teflon "thin wires" widely used in 1968 and 1969 model Fender amps. The D in TFL5000D, means that this amp is a US Domestic model and therefore has a 110V power transformer.
It still has all its original transformers and all original capacitors. The big power filter capactors for sure will need to be replaced for safety reasons.
A Hammond choke was used to replaced the original choke which I found to be open.
The cathode bypass electrolytics were replaced with sprague atoms.
The bias supply cap was also replaced with a sprague atom.
Serial No. A12705
The Dual Showman Reverb Amp is the "head amp" version of the Fender Twin Reverb. It has exactly the same chassis, circuitry and parts (for contemporary models of these 2 amp) but in a more manageable size and weight package (head amp cabinet). That said, the heft of the head unit is still quite substantial, obviously due to the substantially oversized power and output transformers.
IMO, the relatively big and heavy power and output transformers together with the solid state rectifier in these amps are the main factors that contribute to the well-known fender clean tone. The power supply can take large transient/spike load hit (power chording) without or with very little sag. The big iron core in the output transformer just couldn't get saturated that easily either. Result? Fender clean tone for days!
My particular amp says "Showman Reverb Amp TFL5000D" in the faceplate instead of "Dual Showman Reverb TFL5000D". It has the transition "cloth wire" and not the irradiated Teflon "thin wires" widely used in 1968 and 1969 model Fender amps. The D in TFL5000D, means that this amp is a US Domestic model and therefore has a 110V power transformer.
It still has all its original transformers and all original capacitors. The big power filter capactors for sure will need to be replaced for safety reasons.
A Hammond choke was used to replaced the original choke which I found to be open.
The cathode bypass electrolytics were replaced with sprague atoms.
The bias supply cap was also replaced with a sprague atom.
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