Health Checkup: 1978 Marshall 2104 Combo

Рет қаралды 5,451

Жыл бұрын

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!

Пікірлер: 37

@HillbillyHonkey 2 ай бұрын

Steve and Dave Are The GOATs!!! Steve knows Glass, and Dave brings Class!

@johndeschain2156 Жыл бұрын

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.

@jigman992jessee7 Жыл бұрын

Hope all is well. I could only hope that my tech doesn't handle my amp chassis like an old Chevy engine block

@soapboxearth2 4 ай бұрын

Cool , me and Fryette use the exact same chassis stand ! Lol

@75YBA Жыл бұрын

Nobody comments on the intro? Seriously? You guys are legends. All the best from Canada 🇨🇦 eh!

@MAP448 Жыл бұрын

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.

@waynegriffin4360 Жыл бұрын

I could watch and listen to Steve troubleshoot amps all day .............

@SkyAvila983 4 ай бұрын

I have the exact same amp in my studio. Its in perfect condition!

@helwigtonefabrication Жыл бұрын

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.

@75YBA Жыл бұрын

I had a buddy in Kzoo with a ‘78 Fawn 50 Watt half-stack. It had a great sound.

@stevelark9840 Жыл бұрын

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!

@Panhead49EL Жыл бұрын

I feel like I've seen this already.

@leosun8469 4 ай бұрын

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? 🤔

@FryetteAmps 4 ай бұрын

After the preamp master volume, and before the FX Loop.

@leosun8469 4 ай бұрын

@@FryetteAmps Thanks for the reply!👍🏻

@santacruz3600 Жыл бұрын

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?

@jutukka Жыл бұрын

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.

@MrAletube Жыл бұрын

the Neil Geraldo amp!

@odgeUK Жыл бұрын

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?

@FryetteAmps Жыл бұрын

Depends. If measuring voltages at no load, then no load. If measuring at load, then load.

@odgeUK Жыл бұрын

@@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?

@johngormus5855 Жыл бұрын

Steve’s tapping on the tubes and capacitors was in perfect tempo. Must have been a drummer at some point.

@jutukka Жыл бұрын

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.

@conjering 11 ай бұрын

Question, I noticed you constantly disconnect the speaker cable while the amp on, doesn't that cause stress to the OT and tubes ?

@FryetteAmps 11 ай бұрын

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.

@conjering 11 ай бұрын

@@FryetteAmps Thank you for the clarification, and the video is awesome. Love your tools and knowledge

@conjering 11 ай бұрын

@@FryetteAmps I sent an email to you about a JTM50 clone.

@soapboxearth2 3 ай бұрын

@@FryetteAmps YES please

@MrAletube Жыл бұрын

fuses blow after several years of use,they wear out,and when the capacitors charge up...

@JPDESS Жыл бұрын

the hum might comes from an oxidated ground or some lose screws on transfos etc...

@nathanokeefe9169 Жыл бұрын

oh man clean the camera!

@breannaandres1930 Жыл бұрын

This is awesome. I think that it could be of use to research a service such as *promosm*.

@rickya3877 Жыл бұрын

About the capacitors - Psionic guy all but called Stevie a buffoon...not cool in my book

@vadenk4433 Жыл бұрын

If you wanna roast a vintage transformer over a 3 dollar capacitor have at it.

@rickya3877 Жыл бұрын

@@vadenk4433 I guess you know more than Stevie Fryette

@FryetteAmps Жыл бұрын

@@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.

@johnbravo7542 Жыл бұрын

I agree with Lyle,and 95% of the techs out there.