Health Checkup: 1978 Marshall 2104 Combo
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- Опубликовано: 25 ноя 2022
- Our buddy, Bruce Nelson brought over a couple of Marshall combos from 1978 to have Steve give the once-over . In this video we look at the 2104 50w combo!
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Steve and Dave Are The GOATs!!! Steve knows Glass, and Dave brings Class!
clunk clunk, I love it. I always feel like tube amps are so fragile even though I've dropped, banged and tripped over all of mine.
Cool , me and Fryette use the exact same chassis stand ! Lol
Nobody comments on the intro? Seriously? You guys are legends. All the best from Canada 🇨🇦 eh!
Hope all is well. I could only hope that my tech doesn't handle my amp chassis like an old Chevy engine block
Where's the 100? I was so excited to see what was going to happen. I cannot get enough of Steve's thoughts & his processes. Anyways thank you so much for this little nugget. Another wonderful production.
I could watch and listen to Steve troubleshoot amps all day .............
I have the exact same amp in my studio. Its in perfect condition!
I had a buddy in Kzoo with a ‘78 Fawn 50 Watt half-stack. It had a great sound.
Yep, that one was set up for 6550's. On the board you can see 150k ohm power tube grid leak resistors. EL34's would have had 220k. Very cool amp, and great info fellas!
Damn. Good thing this guy isn’t a dentist! 😂 Those knobs are hard to find.. 😅 Check resistance on the power chord. The prongs get loose sometimes.
I feel like I've seen this already.
These videos are so cool- I learn something new every time I watch.👍🏻
Side note:
Small dig at Mesa @ 29:52?…🤣
I wonder where the GEQ is located in the circuit on the Pitbull Ultra Lead?
🤔
After the preamp master volume, and before the FX Loop.
@@FryetteAmps
Thanks for the reply!👍🏻
There is g2, aka a screen (and g3 if the output tube is not equipped with a beam forming plate instead of suppressor grid g3) between the g1 and plate.
I didn’t know about the concerns of powering up an amp after many years. I always just turned them on. I have a few amps that haven’t been turned on in 5 or more years, what is the procedure?
the Neil Geraldo amp!
Steve’s tapping on the tubes and capacitors was in perfect tempo. Must have been a drummer at some point.
Well, you don't need oscilloscope to measure the AC ripple riding on the B+ DC voltage, only a DMM at AC voltage range, unless you really want to see the waveform of the ripple for some reason.
Do you have to have a load on an amp when measuring voltages? Or does it not matter, as long as you aren't actually playing it / sending any input signal?
Depends. If measuring voltages at no load, then no load. If measuring at load, then load.
@@FryetteAmps Ah cool. So no harm to the transformers if the amp is on with no load (nothing connected to speaker out) and you’re just measuring in the circuit?
fuses blow after several years of use,they wear out,and when the capacitors charge up...
Question, I noticed you constantly disconnect the speaker cable while the amp on, doesn't that cause stress to the OT and tubes ?
Not at all. This is the problem with "internet experts". They say things that are untethered to facts and those things spread until they're impossible to undo. This is a perfect example. Thanks for the question though. We think the subject might be worth a video.
@@FryetteAmps Thank you for the clarification, and the video is awesome. Love your tools and knowledge
@@FryetteAmps I sent an email to you about a JTM50 clone.
@@FryetteAmps YES please
the hum might comes from an oxidated ground or some lose screws on transfos etc...
This is awesome. I think that it could be of use to research a service such as *promosm*.
oh man clean the camera!
About the capacitors - Psionic guy all but called Stevie a buffoon...not cool in my book
If you wanna roast a vintage transformer over a 3 dollar capacitor have at it.
@@vadenk4433 I guess you know more than Stevie Fryette
@@vadenk4433 The Psionic guy is welcome to bring his POV to the conversation directly. Meanwhile, until you’re able to differentiate between the operation of the power and output transformers, and articulate exactly when and why a “$3 capacitor” might enter the conversation, you may not be ready to effectively debate this topic. But on the off chance you may have a legit point, we look forward to your detailed video on the subject.
I agree with Lyle,and 95% of the techs out there.