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08-08-2023, 11:46 AM
Hi Guys
When it comes to switching in guitar amps - or anything, really - you have to look at how the switch element will be connected: this can be 'series' or 'shunt'.
"Series" connected switch elements are in series with the signal. The key to recognising the connection is that both ends of the switch element are floating; neither end ties to ground. Series switching would be used for selecting the wipers of pots to tie to the next circuit input, say two MVs feeding the PA.
"Shunt" switches have one end tied to ground. This is what you use to enable a cathode-bypass cap in a gain stage wired the standard way, or to mute a signal by shorting the signal path to ground.
ERK Electronic Relay Kit uses shunt switching only, and was designed to switch the LPSP London Power Standard Preamp, which is L-PRE in our kits. ERK can be used in lots of other places.
For a preamp like D-PRE (our version of the Dumble topology), series and shunt switching is needed, so the over-riding factor in the switch element selection is the need for series switch elements. In this case, you would use traditional electromechanical relays as these can be wired for series or shunt switching.
When looking at the London Power kits, you really must read the entire product description, not just look at the pictures. The description tells you everything about the product, so there is no guessing on what it will do. If there are still questions, email amps@londonpower.com or phone us and we will make sure you end up with the right solution even if it means you do not have to buy anything from us.
When it comes to switching in guitar amps - or anything, really - you have to look at how the switch element will be connected: this can be 'series' or 'shunt'.
"Series" connected switch elements are in series with the signal. The key to recognising the connection is that both ends of the switch element are floating; neither end ties to ground. Series switching would be used for selecting the wipers of pots to tie to the next circuit input, say two MVs feeding the PA.
"Shunt" switches have one end tied to ground. This is what you use to enable a cathode-bypass cap in a gain stage wired the standard way, or to mute a signal by shorting the signal path to ground.
ERK Electronic Relay Kit uses shunt switching only, and was designed to switch the LPSP London Power Standard Preamp, which is L-PRE in our kits. ERK can be used in lots of other places.
For a preamp like D-PRE (our version of the Dumble topology), series and shunt switching is needed, so the over-riding factor in the switch element selection is the need for series switch elements. In this case, you would use traditional electromechanical relays as these can be wired for series or shunt switching.
When looking at the London Power kits, you really must read the entire product description, not just look at the pictures. The description tells you everything about the product, so there is no guessing on what it will do. If there are still questions, email amps@londonpower.com or phone us and we will make sure you end up with the right solution even if it means you do not have to buy anything from us.
