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Technik => Tech-Talk TT-Projekte => Thema gestartet von: danieleb am 24.06.2018 00:07

Titel: JTM45 bypass switch
Beitrag von: danieleb am 24.06.2018 00:07

Hi, I finished now my Jtm, wonderful sound, really cool components, but I have a question about the bypass, I think the resistor on the switch don't mute completely the amp, can I remove it? Ii's a mod? I don't find it in others scheme.

Thank you

Titel: Re: JTM45 bypass switch
Beitrag von: danieleb am 24.06.2018 08:45

R107 by tubetown scheme, the 47K resistor on standby switch.

Titel: Re: JTM45 bypass switch
Beitrag von: Dirk am 24.06.2018 15:40

Hi,

that is right. It is NOT a mute but a stand-by and the resistor in parallel to the switch is a protection for the rectifier tube (less stress for the rectifier tube when turning on the amp again). If you want a real mute, than you must remove the resistor.

Best regards, Dirk

Titel: Re: JTM45 bypass switch
Beitrag von: danieleb am 24.06.2018 16:44

Thank you Dirk, I have 2 1987 RI and this jtm45 is a very very cool amp!
Cheers

Titel: Re: JTM45 bypass switch
Beitrag von: mceldi am 24.06.2018 17:22

@Dirk: the German description of th JTM45 mentions this, but the English does not. Have a look at the English page, and you'll see what's wrong with it.

Cheers
 John

Titel: Re: JTM45 bypass switch
Beitrag von: Dirk am 24.06.2018 22:05

Wir werden uns der Sache annehmen  ;)

Gruß, Dirk