Marshmallow's build thread

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Marshmallow
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Re: Marshmallow's build thread

Post by Marshmallow »

robthemac wrote: Wed Jun 26, 2024 4:33 pm What's this Two Rock / Dumble hybrid going to be putting out power-wise?
50w/25w! Feel free to try it out when you're in Auckland. Are you referring to the black one i posted earlier?
Last edited by Marshmallow on Mon Jul 01, 2024 8:26 am, edited 1 time in total.

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Re: Marshmallow's build thread

Post by MikeC »

Marshmallow wrote: Mon Jul 01, 2024 8:09 am
robthemac wrote: Wed Jun 26, 2024 4:33 pm What's this Two Rock / Dumble hybrid going to be putting out power-wise?
50w/25w! Feel free to try it out when you're in Auckland.
Pentode/triode?
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Re: Marshmallow's build thread

Post by Marshmallow »

MikeC wrote: Mon Jul 01, 2024 8:19 am
Marshmallow wrote: Mon Jul 01, 2024 8:09 am
robthemac wrote: Wed Jun 26, 2024 4:33 pm What's this Two Rock / Dumble hybrid going to be putting out power-wise?
50w/25w! Feel free to try it out when you're in Auckland.
Pentode/triode?
Hey Mike its 6L6 50w

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Re: Marshmallow's build thread

Post by Marshmallow »

Yesterday, I had a bit of time so I spent an hour drilling the rest of the chassis and mounting the power transformer (PT) and some parts. If the amp works well, i'm probably gonna use Mike's connection to predrill the chassis. I also drilled the board and mounted the turrets using a centre punch and hammer for the 2 amps :lol: . Since the chassis is only 350mm wide, I mounted the PT upright with a modified L bracket. Nice and easy solution.

BTW, One of the amps is going to Ramsay.


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Re: Marshmallow's build thread

Post by MikeC »

Marshmallow wrote: Mon Jul 01, 2024 8:25 am
MikeC wrote: Mon Jul 01, 2024 8:19 am
Marshmallow wrote: Mon Jul 01, 2024 8:09 am

50w/25w! Feel free to try it out when you're in Auckland.
Pentode/triode?
Hey Mike its 6L6 50w
But how do you get it to be 25W?
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Re: Marshmallow's build thread

Post by Marshmallow »

MikeC wrote: Mon Jul 01, 2024 8:36 am
Marshmallow wrote: Mon Jul 01, 2024 8:25 am
MikeC wrote: Mon Jul 01, 2024 8:19 am

Pentode/triode?
Hey Mike its 6L6 50w
But how do you get it to be 25W?
Pentode/triode switch. Same what they use in two rocks I think. Doesn't sound as good as the full though.

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Re: Marshmallow's build thread

Post by jeremyb »

How much of the dumble sound comes from the big wattage and big tubes? like could you just have the preamp section paired up with a single 6V6 or a single / pair of EL84s or something like that for a more bedroom friendly dumble style amp?
Slowy wrote: That's the problem; everything rewarding is just such hard work. Regret takes much less effort.

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Re: Marshmallow's build thread

Post by Marshmallow »

jeremyb wrote: Mon Jul 01, 2024 10:05 am How much of the dumble sound comes from the big wattage and big tubes? like could you just have the preamp section paired up with a single 6V6 or a single / pair of EL84s or something like that for a more bedroom friendly dumble style amp?
Yup you could do that. I've built two low wattage amplifiers: one with a single 6V6 and another with a 6SN7. Tonally, they are similar, but offers a very different feel. You still get that dumble tone, however, the lower wattage design has less bloom and earlier break-up but similar tone. And also the single-ended output stage having that second harmonic distortion which can also be a good thing.

For Dumble-style amps, I guess part of the distinctive sounds comes from the higher wattage? with bigger irons, the output stage is "refined" at higher volumes. I guess it's also that effortless tone you get with big wattage. :lol: That reminds me, I need to build a 100 watter next :lol:

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Re: Marshmallow's build thread

Post by Cdog »

Love the pics. Subscribed to thread 😊

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Re: Marshmallow's build thread

Post by jeremyb »

Marshmallow wrote: Mon Jul 01, 2024 10:29 am
jeremyb wrote: Mon Jul 01, 2024 10:05 am How much of the dumble sound comes from the big wattage and big tubes? like could you just have the preamp section paired up with a single 6V6 or a single / pair of EL84s or something like that for a more bedroom friendly dumble style amp?
Yup you could do that. I've built two low wattage amplifiers: one with a single 6V6 and another with a 6SN7. Tonally, they are similar, but offers a very different feel. You still get that dumble tone, however, the lower wattage design has less bloom and earlier break-up but similar tone. And also the single-ended output stage having that second harmonic distortion which can also be a good thing.

For Dumble-style amps, I guess part of the distinctive sounds comes from the higher wattage? with bigger irons, the output stage is "refined" at higher volumes. I guess it's also that effortless tone you get with big wattage. :lol: That reminds me, I need to build a 100 watter next :lol:
Hmmmm I wonder if that could be the kinda thing you could power with that switchmode power supply that was posted here the other day... would be interested to see some pics of your 6V6 powered one!

I guess what my dream would be to have SSS cleans and then I would use drive pedals to get the drive toanz I like :thumbup:
Slowy wrote: That's the problem; everything rewarding is just such hard work. Regret takes much less effort.

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Re: Marshmallow's build thread

Post by werdna »

Thanks for this thread. One day I'd love to own one of your amps.
In life, don't sweat the petty stuff, and don't pet the sweaty stuff.

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Re: Marshmallow's build thread

Post by Marshmallow »

Completed Ramsay's amp last weekend. Started the 40w project, this one's somewhat closer to the studio signature but I mis-ordered a couple of parts so will have to continue this again next week. On a good note, a couple of steel string singer #002 chassis is on its way. :wave: going for 100w. Thanks to Jeremy for reminding me.

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Re: Marshmallow's build thread

Post by Marshmallow »

Two more weeks til the rest of the parts arrive. Have populated 80% of it. In the mean time I'll work on the other stuff.

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Re: Marshmallow's build thread

Post by StrummersOfThunder »

I love those little hot dogs

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Re: Marshmallow's build thread

Post by NZTone.e »

Marshmallow wrote: Tue Jul 09, 2024 7:34 pm Two more weeks til the rest of the parts arrive. Have populated 80% of it. In the mean time I'll work on the other stuff.

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So are you making a 100w version of your two rock Dumble circuit?

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