Marlboro - Quadra Sound Blender QBS  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...

Re: Marlboro - Quadra Sound Blender QBS

Postby Blitz Krieg » 04 Apr 2016, 07:18

Intripped wrote:Am I wrong if I say that you had better take those two 20n capacitors off?
I mean C1 and C2, aren't they two "death caps"?

Bernardduur wrote:Yep, and already done!

They were also part of the noise in my unit


just remove them and it's already better?
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Re: Marlboro - Quadra Sound Blender QBS

Postby Bernardduur » 04 Apr 2016, 15:18

Blitz Krieg wrote:
Intripped wrote:Am I wrong if I say that you had better take those two 20n capacitors off?
I mean C1 and C2, aren't they two "death caps"?

Bernardduur wrote:Yep, and already done!

They were also part of the noise in my unit


just remove them and it's already better?


Yep!
'No more....... loud music.......'

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Blitz Krieg (05 Apr 2016, 07:23)
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Re: Marlboro - Quadra Sound Blender QBS

Postby Bernardduur » 04 Apr 2016, 15:20

Mattyr wrote:I've used a qsbII for many years and I love it. Recently my reverb broke and upon inspection I found that the small wires that hold the spring had broken. The wires have what appears to be a small magnet that sits between the two bars connected to the transducer. How can I repair this and where would I get parts, including a new spring as I would like to alter the effect slightly. I have no education in electronics but I'm not stupid so I think with some direction I should be able to do this. Any input would be greatly appreciated.


I have searched for the same reverb but to no avail. You can have mine as I replaced mine with a Accutronics reverb tank (much better reverb now)
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Re: Marlboro - Quadra Sound Blender QBS

Postby Mattyr » 04 May 2016, 18:02

If you're offering me your qsb reverb tano I enthusiastically accept! Let me know and we can figure out a way for me to pay the shipping fees
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Re: Marlboro - Quadra Sound Blender QBS

Postby Bernardduur » 18 May 2016, 09:24

Mattyr wrote:If you're offering me your qsb reverb tano I enthusiastically accept! Let me know and we can figure out a way for me to pay the shipping fees


Of course, you have a PB
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Re: Marlboro - Quadra Sound Blender QBS

Postby abogicevic » 13 Jan 2017, 12:25

Bernardduur wrote:Schematic time:

Preamp.JPG
Reverb.JPG
Tremolo.JPG


Thanks for schematic, really appreciate it :thumbsup

I also have Marlboro G-50R.
It's wonderfull sounding amp, but it's a bit noisy when I turn it on.
Is it problem with old capacitors, maybe amp needs recap? Do you solved that problem with your amp?
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Re: Marlboro - Quadra Sound Blender QBS

Postby Bernardduur » 20 Jan 2017, 11:49

My amp became a lot more quiet with new caps. I also added a zobel network
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Re: Marlboro - Quadra Sound Blender QBS

Postby abogicevic » 04 Feb 2017, 12:41

Bernardduur wrote:My amp became a lot more quiet with new caps. I also added a zobel network


Thanks! I'll recap mine too. And, ialso I'm going to change reverb tank.
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