Amplifier service

I am starting my SS journey with this Quilter Mini 101. I was going to get the Mini 101 Reverb for the traditional 3 band EQ instead of these EQ curves, but I got a great price on this, and the difference is negligible.


  • 50 watts of “FullQ” power with up to 100 watts on the "clean" settings (Jazz and Surf)
  • Gain, Tri-Q, Voicing, Hi-Cut and Master controls
  • 1/4" high impedance input jack
  • Effects Loop: 1/4" Send and Return jacks
  • 1/8" Headphone jack for quiet practice
  • Dual 1/4" speaker outputs for variable loads 16 to 4 ohms
  • Standard IEC power cable (non locking)
  • Universal power supply -- take it anywhere in the world without need for transformers or switches
  • Ultra compact (roughly the size of a double wide effects pedal)
  • 8 3/8"W x 3 1/8"H x 5 1/2"D
  • 2 Pounds
 
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Coincidentally, I had the noise in my Champ return ; kind of shh-sshh-shhooosh and some crackling
chopsticking the noise definitely coming from the Tung Sol power tube.
It is the original from 2015; though I doubt it has even 100 hrs on it.
Single ended circuit power tubes live a hard life though.

New Russian 6P6s on hand and all is well.
though the 5f1 ckt is about as simple as can be.
 
jtcnj said:
Coincidentally, I had the noise in my Champ return ; kind of shh-sshh-shhooosh and some crackling
chopsticking the noise definitely coming from the Tung Sol power tube.
It is the original from 2015; though I doubt it has even 100 hrs on it.
Single ended circuit power tubes live a hard life though.

New Russian 6P6s on hand and all is well.
though the 5f1 ckt is about as simple as can be.
Click to expand...
Rub it in, why don't you!
 
syscokid said:
Try this link, Ivan:
Marshall Schematics - Tube amp Schematics

Paint copy of power supply schematic for 410:

View attachment 23286
Click to expand...

Thanks Sysco. I did find the JVM210 schematics that show the same power supply scheme. Yes, it is a bit of a maze RVA, & that's only 1 of 4 diagrams that are required to show the whole amp circuit.
We see that the standby switch is located in the power tubes screen grid supply so does have a high DC voltage on it. We also see that the switch has a 100n (0.1uf)/630v capacitor across it. This is there to lessen the "popping" effect created by switching a high DC voltage, though it remains that switches do not like a high DC voltage on them. I do hope it is not a faulty power transformer RVA, though I also have seen them exhibit this type of symptom. I have a JTM45 reissue power transformer here that I replaced in a buddy's amp several years ago that showed this condition. The fault is in the 5VAC rectifier tube's heater supply. The amp exhibited the exact same symptoms as 67plexi described earlier. It would power up & run perfectly until the transformer warmed up, then the rectifier's filament would stop glowing.
I must say that this is not just a tube amp thing though, ANY power transformer can suffer from this just as easily. Nor are solid state amps immune from breakdown, even the venerable Roland Jazz Chorus. I've seen a buddy's old JC in for repair a couple of times in a 15 year period.
For anyone not sure if they've heard a Roland Jazz Chorus amp, have a listen to JJ Cale's album "Naturally," it was recorded with a Roland JC amp.
I hope the Quilter works out well for you RVA & gives long service. Oh, & I agree with flatrockmobile, don't give up on tube amps until you've experienced a "point to point" hardwired type amp. Cheers
 
ivan H said:
Thanks Sysco. I did find the JVM210 schematics that show the same power supply scheme. Yes, it is a bit of a maze RVA, & that's only 1 of 4 diagrams that are required to show the whole amp circuit.
We see that the standby switch is located in the power tubes screen grid supply so does have a high DC voltage on it. We also see that the switch has a 100n (0.1uf)/630v capacitor across it. This is there to lessen the "popping" effect created by switching a high DC voltage, though it remains that switches do not like a high DC voltage on them. I do hope it is not a faulty power transformer RVA, though I also have seen them exhibit this type of symptom. I have a JTM45 reissue power transformer here that I replaced in a buddy's amp several years ago that showed this condition. The fault is in the 5VAC rectifier tube's heater supply. The amp exhibited the exact same symptoms as 67plexi described earlier. It would power up & run perfectly until the transformer warmed up, then the rectifier's filament would stop glowing.
I must say that this is not just a tube amp thing though, ANY power transformer can suffer from this just as easily. Nor are solid state amps immune from breakdown, even the venerable Roland Jazz Chorus. I've seen a buddy's old JC in for repair a couple of times in a 15 year period.
For anyone not sure if they've heard a Roland Jazz Chorus amp, have a listen to JJ Cale's album "Naturally," it was recorded with a Roland JC amp.
I hope the Quilter works out well for you RVA & gives long service. Oh, & I agree with flatrockmobile, don't give up on tube amps until you've experienced a "point to point" hardwired type amp. Cheers
Click to expand...

Roland JC-40 is my next amp....I just haven't decided yet on how great a loss to take on my DSL40C...

Nothing sounds as clean as a Roland.
 
THat said-- i do REALLY enjoy the little Roland Cube -- on teh JC Clean setting-- for low volume Sunday moring improvisational jazz noodles with coffee

HEY -- BAND NAME
Jazz Noodles WIth Coffee....
 
Welcome to the other side RVA, the side of Solid State. Very nice!!!! Unit!! looking forward to your review!!(y) Congrats!!!!!!!!!!!!!!!!!!
 
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