Doog wrote:Fair play, guv. For obvious reasons (that I'm highlighting more for other interested types than yourself), the amp would need to be turned off when swapping the load (speaker) it's going into, or you may be needing a new transformer in the amp.
yeah, a standby switch would be dandy to handle that, but no such luck. these are complaints, mind you, just observations.
i'm still interested in performing the output jack modification, though. let me know what that part is, and i'll sort out installing it. may even be a wiki-able job.
Doog wrote:Fair play, guv. For obvious reasons (that I'm highlighting more for other interested types than yourself), the amp would need to be turned off when swapping the load (speaker) it's going into, or you may be needing a new transformer in the amp.
yeah, a standby switch would be dandy to handle that, but no such luck. these are complaints, mind you, just observations.
I didn't think it was safe to mess with the load even when the amp was on standby either??
Doog wrote:Fair play, guv. For obvious reasons (that I'm highlighting more for other interested types than yourself), the amp would need to be turned off when swapping the load (speaker) it's going into, or you may be needing a new transformer in the amp.
yeah, a standby switch would be dandy to handle that, but no such luck. these are complaints, mind you, just observations.
I didn't think it was safe to mess with the load even when the amp was on standby either??
Michael?
oh, yeah, good point/question. it's probably a good idea to turn it off anyway, but i want to hear the explanation.
Standby is ok, but I advice against doing anything with the main power switch on to an amplifier without a matched load, regardless of the position of the standby switch, but the theory goes as follows:
Damage is caused to the OT when no load or a mismatched load is applied when it is in operation, it will melt the windings through not dissipating the power through the load which will be dissipated as heat instead. "In operation" basically means transferring signal to the output, which is happening when
1) signal is present in the preamp (i.e. from the guitar)
2) the power valves are active and presenting signal to the transformer windings on the "amp" side.
2) is not true if the standby switch is not in "play" position (because the heating elements are active but the power tubes are not active). 2) is also not true if master volume(s) are set to zero so technically you can bias without a speaker load - I always attach one though.
Mike wrote:Standby is ok, but I advice against doing anything with the main power switch on to an amplifier without a matched load, regardless of the position of the standby switch, but the theory goes as follows:
Damage is caused to the OT when no load or a mismatched load is applied when it is in operation, it will melt the windings through not dissipating the power through the load which will be dissipated as heat instead. "In operation" basically means transferring signal to the output, which is happening when
1) signal is present in the preamp (i.e. from the guitar)
2) the power valves are active and presenting signal to the transformer windings on the "amp" side.
2) is not true if the standby switch is not in "play" position (because the heating elements are active but the power tubes are not active). 2) is also not true if master volume(s) are set to zero so technically you can bias without a speaker load - I always attach one though.
so, basically, it's good practice to shut the amp off when switching loads, but standby is OK?
