Differences between current version and predecessor to the previous major change of SolidStateRelay.

Other diffs: Previous Revision, Previous Author

Newer page: version 14 Last edited on January 21, 2018 4:21 pm. by 24.47.226.180
Older page: version 11 Last edited on September 1, 2011 7:54 pm. by 65.68.73.254
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 !!! Relays Dedicated to a Leslie Family (either 122 or 147) 
  
-!! A) [EIS|ElectronicInstrumentService ] (Mark IIa -122 & Mark IIa -147) 
+!! A) [Trek ] (EIS -122 & EIS -147) 
  
-Fast stop slow switching method (extra board for 122 using any S.P.D.T. center off switch ) , eliminates the 12AU7 switching tube in the 122 family, standard cabling compatible with stock Leslies using the tremolo / chorale switching method but not compatible with stock Leslies using the tremolo / stop / chorale switching method in stop mode (the stock amp will still remain on fast when you have the switch on stop). Mounting location is in place of the mechanical relay. To use the stop function, a tremolo / stop / chorale switch is used in place of the tremolo chorale switch. The .1mfd cap removal is required. 
+Fast stop slow switching method, eliminates the 12AU7 switching tube in the 122 family, standard cabling compatible with stock Leslies using the tremolo / chorale switching method but not compatible with stock Leslies using the tremolo / stop / chorale switching method in stop mode (the stock amp will still remain on fast when you have the switch on stop). Mounting location is in place of the mechanical relay. To use the stop function, a tremolo / stop / chorale switch is used in place of the tremolo chorale switch. The .1mfd cap removal is required. 
  
-Switching scheme: apply a common-mode DC bias on the input of greater than 25 volts for _slow_; apply zero volts for _fast_; apply from 9 to 13.5 volts for _off_. Note that if you plug the relay into a stock control kit for a 122, you'll get normal two-speed (_fast_/_slow_) operation. 
+Switching scheme: apply a common-mode DC bias on the input of greater than 25 volts for _slow_; apply zero volts for _fast_; apply 12 volts for _off_. Note that if you plug the relay into a stock control kit for a 122, you'll get normal two-speed (_fast_/_slow_) operation. 
  
  
 ! Vendor comments 
-The Mark IIa Solid State relays for Leslie 122 and 147/251 provide noiseless, quick and extremely reliable motor control. Installation is simple - they are 100% compatible with existing Leslie control circuits and no additional wiring is required from the console. All necessary materials for installation (except the three position switch) and complete instructions are provided. As a bonus for 122 users, switching time with this device is virtually as fast as the 147. Our 122 relay also makes converting 147 amplifiers to 122 specs a snap. The relay control tube is eliminated, as are a number of other components! For the 122 version, an optional, low cost ($2.00) board interfaces with the TREK II TS2-3, or any S.P.D.T., center off switch. The 147/251 version will interface with the TREK II TS2-3 as well. The 122 version will operate on any voltage from 80 - 300 and any frequency from 25hz to 80hz. The 147/251 version operates from 80 - 240 vac. Either will operate on any frequency encountered. If the console switching is modified for tremolo-off-chorale operation, all Leslies used must be equipped with EIS relays. Although no damage to a stock Leslie will occur, switching will be erratic.  
  
-All of our solid state relays are totally compatible with legacy Leslie switch kits. They will function exactly as the stock relay, minus noise and clicks and last virtually forever . If you opt for 3 speed operation , all Leslies must have our relay, however, if used as a replacement two-speed relay, go ahead and run them together.  
+Originally manufactured by [EIS], the Trek II EIS series of Solid State relays for Leslie 122 and 147/251 provide noiseless, quick and extremely reliable motor control. Installation is simple - they are 100% compatible with existing Leslie control circuits and no additional wiring is required from the console. All necessary materials for installation and complete instructions are provided . As a bonus for 122 users , switching time with this device is virtually as fast as the 147. Our 122 relay also makes converting 147 amplifiers to 122 specs a snap. The relay control tube is eliminated , as are a number of other components!  
  
-The interface board for the 122 version allows the use of the TREK II TS2-2 , ETS2 -2 , or any S.P.D.T. center off switch to obtain Chorale - Off - Tremolo. The 147 version has software that makes this board unnecessary
+The EIS- 122 and EIS-147 solid state relays are totally compatible with legacy Leslie switch kits. They will function exactly as the stock relay , minus noise and clicks and last virtually forever. If you opt for 3 speed operation, all Leslies must have our relay, however, if used as a replacement two -speed relay , go ahead and run them together
  
 Either version can provide Chorale - Off - Tremolo with a three position switch as used in the Main - Ensemble - Echo Leslie switches. Instructions and the necessary diode are included with the relay. 
  
 In the 122 version, a 33V to 36V 1 watt zener diode may also be added to stock Leslie 8000 style kits to decrease switching time. 
-Stop mode requires a 12V zener diode in switching circuit.  
  
 147 3 speed version: Functionally, just like the 122 version.  
 When first powered on, the relay responds to 0v for Tremolo and 120v (or 240v on export units) for Chorale.  This makes it compatible with legacy switching kits.  If a three-position switch is used, a diode is added to provide 1/2 wave DC. The processor has a "learning" mode to detect 1/2 wave and configure for three-speed operation, 120 (240) for chorale, 0v for stop and 1/2 wave for Tremolo. 
-  
-If you install the tremolo control circuit in the pre-amp, use a 33V - 36V 1 watt zener diode to ground, in parallel with the 47K, 1W resistor. The cathode (banded) end goes to the resistor junction. This limits the switching voltage to the zener value, prevents the momentary off condition when switching from chorale to tremolo and greatly decreases the switch response time, almost as fast as a 147 (A.C.) relay. It also prevents core saturation in the output transformer.  
  
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 !! B) [Hamptone] (HT SSR-122 & HT SSR-147) 

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