Greetings, Well, I’m finally going to let it go: I have a NEW IN ORIGINAL BOX Fisher SpaceXpander Tube Driven Spring Reverb from Fisher Spacexpander Tube Spring reverb The space expander | Musical Instruments & Gear, Pro Audio Equipment, Signal Processors/Rack Effects | eBay !. Hi, The Fisher Spacexpander takes a Is the 12DW7 a substitute for the ? Thank you Ed.
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Discussion spacexpahder ‘ Tube Audio ‘ started by fdwrenchJun 13, Log in or Sign up. Hi, The Fisher Spacexpander takes a Is the 12DW7 a substitute for the ? It’s the perfect replacement. The is merely a low noise version of the 12DW7. I got this thing plugged in to my Fisher but there is not much reverb.
I can barley hear a difference in the normal mode. Anyone have any idea where I might look? It does not have a remote. It has a pot attached to the chassis. Without a potentiometer connected to the “remote” jack wired as per the schematic you won’t get spacexpqnder reverb signal, this is normal.
Anonymous’s review – Fisher SpaceXpander K10 – Audiofanzine
The remote pot is for adjusting the reverb signal level mixed with the “dry” signal. Also check the wiring to the reverb unit spring tanka reversed crossed connection will result in no or very faint reverb signal. The pot attached to the chassis is the “hum fisyer for cancellation of any residual hum.
TubologicJun 17, Thank you for the reply. It does have a K ohm potentiometer installed where the plug socket for the remote should be.
There is some reverb effect and the pot does control it but there is just not much. Provided that the K pot is correctly wired there’s not much who can wrong but the reverb tank fishher the driver amp.
Is the reverb tank the original one? A picture would be helpful. You can test the reverb driver amp by connecting a headphone to the yellow and green wires coming from the small transformer remove the tank and turn the pot fully CWyou should have plenty of volume.
This cap goes to the red wire of the driver transformer. I believe that it is the right tank.
Fisher Spacexpander / Baleine reverberation | I’ve drop… | Flickr
It does say Spacexpander k10 on it. As far as I can tell the pot is wired correctly. I risher be expecting too much. I am going by the reverb that I had in my car in the 60s.
It had lots of reverb and when you hit a bump in the road fihser made all kinds of noise. The good old days. Yes, it’s the right tank. Replace C3 see my previous postchances are good it will be the culprit.
If the wires to the tank are reversed, there will be no reverb at all. The spring driver in the tank has an impedance of 8 ohms, while the receiver in the tank has an output impedance of several thousand ohms.
Therefore, reversal will cause a complete no reverb condition. Drive is surely important, but just as important is the preamp circuit that amplifies the spring signal.
Fjsher as with your 60’s driving experience, the same is true of this unit as well. A good rap on the spring tank should produce a noticeable racket from the speakers. If not, the preamp circuit should be investigated for proper operation as well. If drive to the tank is the problem, the most likely problem in the drive circuit is C3. This unit also likely uses one of Fisher’s classic selenium bridge rectifiers.
While all selenium units will sag with time, the small low current ones are rather famous for it, and for sagging in a big way when they do. If this has happened, it would certainly reduce drive as well. If none of the above efforts resolve the issue, then a check of the power supply voltages would be the next step in your troubleshooting efforts. Spacexpaander replaced the c3 cap, that may have made a little improvement.
I switch it to reverb only and it is definitely working. In the normal mode the pot is turned all the way clockwise and you can hear a slight reverb.
NEW IN BOX Fisher SpaceXpander Spring Reverb
When I rap on the tank there is a noticeable racket from the speakers I will check the power supply next. I have never heard one working so I do not know what to expect. You must log in or sign up to reply here. Share This Page Tweet. Your name or email address: Do you already have an account?
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