Rickenbacker TR 25 Guitar Amp.
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- paologregorio
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Rickenbacker TR 25 Guitar Amp.
Anyone out there, other than Graham, have a TR 25? I wbought one two years ago on Graham's recommendation. Fantastic 25-watt amp. Solid sate, and sounds as warm as a tube amp. Nice vibrato and reverb.
Does anyone have one of these, and if so, do you have the original footswitch? I'm using a Fender Twin footswitch for mine.
Does anyone have one of these, and if so, do you have the original footswitch? I'm using a Fender Twin footswitch for mine.
There is no reason to ever be bored.
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
Re: Rickenbacker TR 25 Guitar Amp.
Interesting. I'd love to hear what its 12" can do. I have 4 TR7's and love 'em (obviously, if I have four). One of them is a "Gem" though, not a Rick, but aside from the name is exactly the same as far as I can tell. I've been running a new pedalboard I wired up with 3 channels - via a Morley ABC, 1 channel is "guitar" through regular guitar pedals, 2 is "keyboard" which runs through things like a rotary speaker emulator, filter modeler, and synth sounds, and 3 is an octave pedal to a bass amp. The "keyboard" channel runs stereo to a pair of TR7's!
- paologregorio
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Re: Rickenbacker TR 25 Guitar Amp.
Interesting!
The only things I have to record video are my laptop and my IPhone; I doubt either is ideal for a sound sample. The TR25 is an excelent 25-watt amp; as warm to my ear as a tube amp. It's my main small rehearsal amp. I used it for practices when I was in OCBI with Joey Vasco and Mark Pytko.
The only things I have to record video are my laptop and my IPhone; I doubt either is ideal for a sound sample. The TR25 is an excelent 25-watt amp; as warm to my ear as a tube amp. It's my main small rehearsal amp. I used it for practices when I was in OCBI with Joey Vasco and Mark Pytko.
There is no reason to ever be bored.
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
- paologregorio
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Re: Rickenbacker TR 25 Guitar Amp.
Bump?
There is no reason to ever be bored.
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
-
- Member
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- Joined: Mon Jun 18, 2007 5:12 pm
Re: Rickenbacker TR 25 Guitar Amp.
I have one. Nice and portable. The only thing holding them back is anti-solid-state snobbery, I think.
- Ontario_RIC_fan
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Re: Rickenbacker TR 25 Guitar Amp.
I own one too.
I used it in a stage play last year, with my 1977 JG 620. It nails the classic RIC tone.
Brian
I used it in a stage play last year, with my 1977 JG 620. It nails the classic RIC tone.
Brian
Brian Morton
A Rickenbacker Fan
in Hamilton, Ontario, Canada
=========================
67 FG 625
74 JG 4000
76 JG 430
77 JG 620
77 JG 320
79 MG 450
79 JG 4001
80 FG 620/12
81 BG 480
91 JG 610
02 BG 620
78 TR7
83 TR25
A Rickenbacker Fan
in Hamilton, Ontario, Canada
=========================
67 FG 625
74 JG 4000
76 JG 430
77 JG 620
77 JG 320
79 MG 450
79 JG 4001
80 FG 620/12
81 BG 480
91 JG 610
02 BG 620
78 TR7
83 TR25
Re: Rickenbacker TR 25 Guitar Amp.
I acquired one last weekend.
I've not tried it out yet; it was being used for demos on a seller's stand at a guitar show.
I've not tried it out yet; it was being used for demos on a seller's stand at a guitar show.
Re: Rickenbacker TR 25 Guitar Amp.
I have one...was my first guitar amp--bought it in the late 70's. Unfortunately mine just went on the fritz and i need to fix it--it sounds great for bass but it think I over did it and rattled something loose inside after 40+ years
- paologregorio
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Re: Rickenbacker TR 25 Guitar Amp.
I just turned my TR25 amp upside down, and discovered the amp has an extension speaker jack, additional to the footswitch jack, which I knew about.
Does anyone know what ohm speaker is correct to connect to the amp?
Does anyone know what ohm speaker is correct to connect to the amp?
There is no reason to ever be bored.
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
Re: Rickenbacker TR 25 Guitar Amp.
The schematic is a little blurry, but appears to say 16 ohms when I zoom way in: http://www.rickenbacker.com/pdfs/19341.pdfpaologregorio wrote:I just turned my TR25 amp upside down, and discovered the amp has an extension speaker jack, additional to the footswitch jack, which I knew about.
Does anyone know what ohm speaker is correct to connect to the amp?
- paologregorio
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- Joined: Wed Aug 08, 2007 12:56 pm
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Re: Rickenbacker TR 25 Guitar Amp.
scott_s wrote:The schematic is a little blurry, but appears to say 16 ohms when I zoom way in: http://www.rickenbacker.com/pdfs/19341.pdfpaologregorio wrote:I just turned my TR25 amp upside down, and discovered the amp has an extension speaker jack, additional to the footswitch jack, which I knew about.
Does anyone know what ohm speaker is correct to connect to the amp?
Thanks, Scott! Much appreciated. Interesting; I could replae the speaker with another I have on hand.
I wonder if the extension cabinet speaker would be 16 ohms as well?
Does anyone here own a Rickenbacker extension speaker cabinet? I've only seen the older type speaker cabinets, with the blue-silvery-gray tolex at RIC, I think.
Rick amps are quirky; there's a footswitch jack for the reverb/tremolo, but no one I've asked who has the same or similar Rick amps has a foot switch. When I asked, John Hall confirmed a Fender two-button reverb/tremolo footswitch would work, so I use one of those ... the same footswitch also works on my Ampeg Reverbojet.
There is no reason to ever be bored.
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
...why yes, I suppose I do have a double bound guitar fetish...
"Uh, I like the double bounds. . . ."
Re: Rickenbacker TR 25 Guitar Amp.
I have one, too. Bought it back in the late nineties in Switzerland. Whenever I record a Rickenbacker 12-string, I use this amp. It seems that the solid state technology suits the 12-string sound a lot, just as the Roland JC-120 does...
Re: Rickenbacker TR 25 Guitar Amp.
Yes. Any extension speaker will be connected in parallel with the internal one. If the internal speaker is 16 ohm, using a 16 ohm extension will ensure equal power distribution to both speakers. With both speakers in use, the impedance seen by the amp's output stage will be 8 ohms, which will most likely be the lowest impedance the amp can be safely worked into.paologregorio wrote:I wonder if the extension cabinet speaker would be 16 ohms as well?
Don't be tempted to connect an 8 ohm extension cab. This will result in two things:
1. Two thirds of the amp's power will go to the extension cab; one third to the internal speaker
2. The amp will be working into a load of 5.3 ohms, which may be lower than it's designed for. Working a solid state amp into too low a load can overstress the output stage and cause overheating/failure.
2004 4003 JetGlo
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Yamaha BB414
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Roland Bass Cube 100
Epiphone Jack Casady
Ovation Magnum 1
Mania VTB-4BS
Dean Stylist w/ John Birch Magnum II pups
Yamaha BB414
Trace Elliot VA350/GP11 Mk1
Peavey TB-Raxx
2 BFM Omni 10.5 crossfire cabs
Roland Bass Cube 100
Re: Rickenbacker TR 25 Guitar Amp.
Nice thread!
Bought a TR25 today, the version with black grill cloth with logo. I remain amazed by the contrast in prices of Rickenbacker guitars & basses vs their amps.
Allow me some rambling & questions, thanks! In case anyone feels like responding, for convenience I've added some numbers.
#1
Needs some work, on times there's a background-buzz as if the distortion was engaged, and currently the tremolo does not work.
Should all be fixable. Perhaps some adjustments will fix it already (power-stage bias, in case the background-buzz is due to too low biasing),
I saw there's also a tremolo-trimmer.
#2
Wondering about the serial number decoder on the Rick-website - I read somewhere it also works for amps, but not for the serial I entered.
[edit: just read elsewhere the leading zeroes should be removed, OK, thanks Ontario_RIC_fan!] result --> 1980
#3
Also read there are several reverb tank types mentioned for the TR25. My TR25 has the OC type 56.
#4
Speaker seems original (square magnet), codes SP122O16G and 12VPGI16A 67.7631
No idea about how to decode.... I figure '16' will refer to the 16 Ohm speaker-impedance, ... 7631 possibly to 31st week of 1976? (No idea which period the TR25 was produced).
#5
Power-switch has been replaced by another type (red pushbutton) - I'd like to re-install the original ON-OFF-ON type again, anyone has a closeup, or type-number of the original black switch ?
#6
Amp has a 10nF 'Death Cap', as also shown on the schematic. Will be disconnected/removed (see https://robrobinette.com/Death_Cap_and_ ... Switch.htm ).
#7
All pots PCB mounted, so was a bit surprised to see the absence of nuts, to avoid external force to the knobs potentially damaging the PCB. OK, all seems sturdy so far - perhaps my amp happens to be missing those nuts, but other TR25s do have them? Only the DISTORT-pot has a nut, all others have felt washers.
OK, enough for now, any response welcomed.
Bye
Bought a TR25 today, the version with black grill cloth with logo. I remain amazed by the contrast in prices of Rickenbacker guitars & basses vs their amps.
Allow me some rambling & questions, thanks! In case anyone feels like responding, for convenience I've added some numbers.
#1
Needs some work, on times there's a background-buzz as if the distortion was engaged, and currently the tremolo does not work.
Should all be fixable. Perhaps some adjustments will fix it already (power-stage bias, in case the background-buzz is due to too low biasing),
I saw there's also a tremolo-trimmer.
#2
Wondering about the serial number decoder on the Rick-website - I read somewhere it also works for amps, but not for the serial I entered.
[edit: just read elsewhere the leading zeroes should be removed, OK, thanks Ontario_RIC_fan!] result --> 1980
#3
Also read there are several reverb tank types mentioned for the TR25. My TR25 has the OC type 56.
#4
Speaker seems original (square magnet), codes SP122O16G and 12VPGI16A 67.7631
No idea about how to decode.... I figure '16' will refer to the 16 Ohm speaker-impedance, ... 7631 possibly to 31st week of 1976? (No idea which period the TR25 was produced).
#5
Power-switch has been replaced by another type (red pushbutton) - I'd like to re-install the original ON-OFF-ON type again, anyone has a closeup, or type-number of the original black switch ?
#6
Amp has a 10nF 'Death Cap', as also shown on the schematic. Will be disconnected/removed (see https://robrobinette.com/Death_Cap_and_ ... Switch.htm ).
#7
All pots PCB mounted, so was a bit surprised to see the absence of nuts, to avoid external force to the knobs potentially damaging the PCB. OK, all seems sturdy so far - perhaps my amp happens to be missing those nuts, but other TR25s do have them? Only the DISTORT-pot has a nut, all others have felt washers.
OK, enough for now, any response welcomed.
Bye
Re: Rickenbacker TR 25 Guitar Amp.
FWIW, note that the TR25 schematic likely has a small drawing error in the tremolo-LFO section. (LowFreqOscillator)
Unlike the 'more usual' phase shift oscillator (topology with 3 cascading RC-sections), Rickenbacker uses a Twin-T oscillator.
As drawn in the TR25 schematic it won't work, the midpoints of the T's are joined, but shouldn't.
The horizontal line between "the two stacked 0.1uF caps" on the right, and "the 0.1uF cap that connects to the two stacked 1M resistors" should be removed.
The schematic of for instance the TR7 shows the topology that will have been intended. And is drawn in a fashion that more clearly illustrates the Twin-T nature of the oscillator.
Just sharing...
Unlike the 'more usual' phase shift oscillator (topology with 3 cascading RC-sections), Rickenbacker uses a Twin-T oscillator.
As drawn in the TR25 schematic it won't work, the midpoints of the T's are joined, but shouldn't.
The horizontal line between "the two stacked 0.1uF caps" on the right, and "the 0.1uF cap that connects to the two stacked 1M resistors" should be removed.
The schematic of for instance the TR7 shows the topology that will have been intended. And is drawn in a fashion that more clearly illustrates the Twin-T nature of the oscillator.
Just sharing...