Steve and his shop make me think of some mad genius scientist from some old horror movie.

That particular amp is legendary 🤘🏻

Steve Fryette, you sir are a legend, innovator, and such a wealth of knowledge!

Thank God for this era of technology and videos by and with people like this! So awesome!

@cragginshred

Ай бұрын

Amen!

I had a model 1991 Super Bass (circa around 1970) that had to have some kind of distortion pedal added to it for guitar. Owned it for like 30 years before buying a Deliverance 120. The days of big clean Marshalls.

@popeye089

Жыл бұрын

I have 2 Super Basses, they are model 1992s I think you meant, no pedals needed. Just dime them and the guitar............the cleans are lush AF too, but Super Basses were used by the likes of Page, Kossoff, Hendrix, etc....they distort, you just have to drive them

That amp is a legend itself and Steve is certainly up there as well. Great video

I've restored a few older amps and I've gotten the habit of starting out on a variac. I'll hook up my leads across a tube heater and stop the variac when there's 6.3 volts and make note of what the AC voltage. My Framus Dragon is happiest at 117VAC along with my '81 Marshall JCM 800.

@popeye089

Жыл бұрын

I run everything on 110 myself, everything seems happy. But I also have them biased at 110

I have no idea what is what with electrical components, but watching this really gave me insight into the nuances of amps. One of the most informative videos I have watched in a long time. Thanks. thumbs up and sub.

From my experience, crossover distortion adds to the overall amps distortion and doesn't sound bad. It adds some overtones that makes the sound more rich , if you're cranking the amp

This is pure gold!

thank you for this video so much!!!

My ‘68 JMP also has the small tag board with the diodes next to the power transformer.

Can’t wait to see this

Sounds analogous to buying a new guitar, changing the tuners and strings and not turning the guitar when finished! 😩. Hope you follow this up with a video explaining how to bias a Friedman Plex 🤞❤️

Brilliant, brilliant man. One of his videos make up for a 1000 bad ones from others.

It would be good to hear the results

So much history.

those orange drops caps have less mids. it's a interesting mix of parts.

Fun fact: Mullard was actually owned by Philips since 1927. I used to work for Philips Netherlands in the 80ies and our dpt did the production planning also for the Mullard Blackburn factory . Philips used the Philips Miniwatt label and Philips Mullard still used the Mullard Label until they stopped producing in 1988

This video is gonna make some instant DIY amp techs, this is Shocking!🤣

I do believe i will have to try a switchable touring circuit in an upcoming build. Maybe a 50k mid pot too?

You said it was difficult to measure the dc resistance of the OT under load but then made it look pretty simple after all - can you explain what you meant?

@FryetteAmps

Жыл бұрын

Any noise bleeding into the power tube grids during test will skew the results.

My brain is melting 🧠

If I have a 1993 1987x, how far am I from the specs of this amp? Lots of changes required to sound similar or can I just Variac it and bias accordingly?

Who is playing INTRO & OUTRO ? & what amp are they using ? Great sound!!! 😀😁. U guys Rock!! 👍🏽🇺🇸

@JoeGambleGuitar

Жыл бұрын

That's me. The intro was a Fryette Deliverance Series II D-120 and the outro was a Grosh DG-50 50w Plexi- just dimed with no pedals. Thanks!

@JoeGambleGuitar

Жыл бұрын

@@MahoganyToothpick The intro I did with the PL-IR using the Sound City Cab/F70 IR. I did the outro 10 years ago with an Ultimate Attenuator and a Grosh 2x12 cab loaded with Scumback M75s. Inputs were daisy chained.

My 71 SC 50 Plus has bias mods to account for the USA 120, Regardless of the Bias, I love the VariAC to drop the Voltage. It Loves 116 v. The Original design was for 115.v I do not know how to describe it but It sounds more open and breathing freely? Ant the Fryette Power Station also helps to dial it into its wheelhouse without the neighbors getting all wrankled. Trying to find somebody to restore the bias circuit to original spec.

I haven't seen a bright cap. Did I miss it?

how many volts are you sending to the amp @ 1kHz? What is the rule of thumb? 1 volt p-p?

I’d love to bring in my Hiwatt DR-103 and Sound City 50’s as well as my Marshall Astoria Classic for biasing and correcting. Someone ran EL-34’s in my KT-66 designed Astoria and I just need it checked please? I’m in Riverside CA. You’d invited me years ago Mr. Fryette. So can I get with ya sometime soon? Thanks, Tom

Ive had my 50 w 1968 small box plxi for 40 years. It has a fan inside but otherwise bone stock i have benched onc a year thou im retired now and it gets low hours now . i wish i could get the telefunken el34 tubes . nos are a ripoff ! It never sounded as good as with those tubes . it still shines. Out of all my marshalls this thing is a little monster cheers!

@FryetteAmps

Жыл бұрын

A pair of Siemens usually go for around $130-$150. Those are usually RFT which were made in the same factory (the former East Germany) that produced Telefunken in the 70-80s. Check out the Hiwatt From Hell vid to hear those. kzread.info/dash/bejne/eqqXmtmgqa3Af5s.html For our money, you can't go wrong with the current Mullard EL34s. They sound just as good - and they're new!

@mariannwatt2678

Жыл бұрын

Thanks ill do that next checkup i have for it cheers

@DANTHETUBEMAN

Жыл бұрын

i run new Mullards and my ears like them.

@analogblues9606

Жыл бұрын

Is your 68’ a Bass or Lead model? Thinking of getting a 68’ clone but not sure which model. Dave semi converted it to a lead but still kept 0.1’s for output coupling’s.

That is a PRO.

Is it worth it to add a potentiometer to a self biasing amp? How would one go about this on an 18 watt clone?

Is this guys nick name "SURGEON" by any chance? 😁 I swear he reminds me of a real gifted Brain or heart surgeon for some reason? 😂 Steve the surgeon fryette? works for me.

What is that Hendrix mod more specifically??

I wish there was a way to measure crossover distortion at home. I can bias an amp just fine using a DMM via any of the common methods (shunt method, OT resistance method, cathode resistor method, etc.). But none of that actually shows you if the amp is out of crossover distortion territory.

@FryetteAmps

Жыл бұрын

The correct bias setting is usually not a hard value and can vary based on a variety of circumstances. Also, a good idle setting may not entirely eliminate the crossover notch, and trying to eliminate the notch visually may result in an excessive idle setting.

@FourT6and22

Жыл бұрын

@@FryetteAmps Sure. But I wish I had a way to confirm. i.e. Set bias like I usually do and then visually see if there's still crossover. But I don't have all that test equipment. Would be cool if there was an affordable handheld signal generator/scope all-in-one that didn't take up so much space. Maybe there is. I haven't really looked.

@michaelknight4041

Жыл бұрын

@@FourT6and22 fluke makes a scope meter with built in signal generator. My work had one. I can't imagine they are cheap tho.

Who's the camera man? Marc?

Someone should copy this and put it into production, limited release of 5, sell em for 10K each! Plexi glass front panel!

I have one of these.....I need to send it to you ....Awesome amp but I think it could be better

@FryetteAmps

Жыл бұрын

Contact support@fryette.com

I'm confused by something, which I hope you can help me to understand. I'm not an electrical engineer, but my close friend is - and he works on amps all the time. He once told me that biasing is something you do with the tubes removed, thus there was no such thing as "re-biasing for new tubes". From my own personal experience, I've been playing guitar for 55 years and have owned dozens of amps (Fender, Marshall, Vox, Sound City, Mesa/Boogie, Line6) and have never, ever had anyone re-bias when I changed tubes. The amps always sounded better with new tubes and nothing else. So what am I missing here ? (please be kind, I'm just a guitar player)

@FryetteAmps

Жыл бұрын

First, we're talking about the power tubes specifically. Second, the laser focus on biasing is a relatively recent trend, meaning over the last 30 years. Before that, not a lot of attention was paid to it, and often it wasn't mentioned on a service ticket. So, it may very well have not been done or done without it being stated. Third, many amps did not have adjustable bias, and some still don't. Finally, tubes must be installed and operating to set it properly if it is adjustable.

@U2WB

Жыл бұрын

@@FryetteAmps Thank you for your kind reply. To be clear, I have never had an amp serviced; I’ve changed a tube here or there when it either became microphonic or started to glow obviously differently from its companions. Once or twice I replaced the whole set of power tubes to get it back to sounding new again, and it always did. (This was on the Marshall JTM30 and I believe my Sound City 120. Other amps only needed 12AX7 preamp tubes refreshed, and I always replaced all of them together as you would a set of batteries.

@FryetteAmps

Жыл бұрын

@@U2WB Check out the new episode this Sunday at 6PM PT. You bring up an important point that merits some consideration.

@U2WB

Жыл бұрын

@@FryetteAmps Thank you once again !

That is a Duane Allman Special.

The science of ampolagy variables'

Why don't you put bias points on the back and move that bias pot to the back, so Dave can change the bias faster.

@FryetteAmps

Жыл бұрын

After 30 years, one would assume Dave could have done that had he wanted to :)

What's funny there is a small world of take any thing repair shops. What that means Not Hand Wired. You can spend half a day disassembling a Mesa or a 5150, or Fender [Modern] before you even get to the electronics. The shop manager at this place would take these amps and get $350.00 out of them. And easy to work on.

This amp is really not stock and bastardized. The caps have drifted so far out on the B+, a typical 100,50,50,50,50 or 100,50,50,32,32 is 130, 88, 48, 28, 28 ish!! The couplers are 100n instead of 22n, a 330u had been added to the .68 on the 2.7s up front. I see the droppers are 8.2k / 8.2k instead of typical 10k / 10k, probably because the lower B+, so not as much dropping voltage, so voltage to the pre is what a typical Marshall would be. Didn't quite see the NFB resistor (would have to go back), but a see the original ha been cut out and leads of the new resistor tagged to the leads left from the original!! Lots of craziness to this amp and over time! The thing(s) to not is blueprint it to where is is currently, which is 450V at standard voltage...130, 88, 48, 28, 28 B+, 8.2k / 8.2k droppers, the added 330u / 250u caps, etc. Not quite 70%, with 25W dissipation, was running at 67% and 62% in standard and 90V variac modes. Nice video to document everything. Interesting approach to dropping input until heaters were in spec at 6.3V, etc.

@FourT6and22

Жыл бұрын

I don't understand dropping the mains voltage until heaters are at 6.3V. When the owner plugs the amp in at home or in a studio or on a stage, they aren't going to measure the mains voltage and adjust with a variac unti they measure 6.3v on the heaters. Nobody does that. The MOST anybody is going to do is use a voltage regulator that keeps your mains at 120v +/- a few volts. I think Furman units are plus/minus 5v. So... if your amp's heater voltage is off, what are you gonna do? Nothing. You're gonna plug it in and rock out. I guess it's nice to document that kind of thing on the bench so you can get a baseline measurement. But once it leaves your bench, it's not gonna matter.

@dougmorisoli6482

Жыл бұрын

@@FourT6and22 Dave certainly has the ability to monitor his amps. I’m just a peon but here’s what I do: I have a Furman power conditioner with a volt meter and I plug the amp into it. Then I plug the Furman into the Variac and adjust to the voltage that got 6.3v when I biased.

@FourT6and22

Жыл бұрын

@@dougmorisoli6482 You do that every time you plug your amp in somewhere new? At home? At a bar? At rehearsal? At a club? At a friend's house?

@dougmorisoli6482

Жыл бұрын

@@FourT6and22 yep. all that is involved is turning variac so the voltage in my rack power conditioner is equal to the reference voltage I biased for. Adds 20 seconds more to the power cord plug-in time. The only pain is hauling the variac. It’s small but still one more gadget to lug around. It’s just a small rack with the furman, tce effects, mp1 and spx.

Why do you keep interrupting one of the most knowledgeable amp guys in the world when he’s tryin to answer your question The first time you did it I guess you didn’t see the offended look on his face when he had to stop his response mid thought

for some reason old dudes with earrings creep me out

You must live near a police station and a railroad crossing judging by the sounds included in this video. The train horns are cool, but the cop sirens have to go. 😊

@humbucker1414

Ай бұрын

That's called SoCal.

orange drops in a plexi? blasphemy

Seriously ?? The Duty Cycle being dissimilar is due to a mismatch in Time Constants on each side of Phase Inverter..... Get a clue before you make videos...

@FryetteAmps

Жыл бұрын

Armchair expert schooling nobody in particular...

@charliekrengel1344

Жыл бұрын

... Did you just imply Steve Fryette doesn't have a clue about amp repair? Either you don't have a clue, or you're actively trolling.

@DANTHETUBEMAN

Жыл бұрын

@@FryetteAmps a guy just out of electronics school would build a terrible guitar amp, it having the highest fidelity he could get, not knowing it's this cascade of failure and sound character of parts that makes the magic happen for a rock guitar amp.

Stop stressing the components constantly. Eventually, you will have to reflow solder.

Uh this is kinda scary. Dude owns an amp company, but doesn't know how to work on amps? Hard pass on one of those.