Відео

Thank you Raymond

ou are too kind, Dwight

Aha! Now I understand Dwight. You are much less likely to see crossover distortion (COD) in a cathode-biased power section. You usually see COD when an amp is biased too cold where one power tube is turning off before the other is turning on, often with less than 50% of maximum dissipation. As a cathode-biased amp is usually well biased at 90 to 105% it is improbable it will experience COD.

@@theguitaramptech Ok Chris thanks again. I figured that as much since cathode biasing Causes the tubes to amplify the whole since wave cycles. Iv heard that it is called class A push pull. Dwight.

Yes, I have heard your point of view many times. My thoughts: 1. The person doing the work either doesn’t know how to test components or doesn’t have the equipment to test components or doesn’t know how to use his test equipment to test the components. For example, you may know how to measure the ESR of an electrolytic capacitor. You may have an ESR meter. If you do, please reply and tell me what frequency it measures at. Do you know why the measuring frequency matters? 2. If you gave me your expensive 1965 Blackface Princeton that was making a crackling noise and I gave you back your amp with those “noisy” carbon comps replaced with blue metal films, and the Blue Molded caps replaced with Orange Drops would you be happy with me, or, angry with me, because I could GUARANTEE that your amp would sound different? It would also lose a hell of a lot in value. If you are an amp owner, then you have the right to do what you like to do with your amp. However, if you are an amp tech you owe it to your customers to get training/knowledge to respectfully service an amp. For a good tech, it is more than a matter of “each to their own”. If your Tech suggests a shotgun replacement, it's time to find a new Tech.

Yes, he is always with me, Les. The only time he is removed from my workshop is when I am working in close proximity to life-threatening voltages and he tries the "head flick" of my hand onto his head for an enforced pat, otherwise he is wonderful company to have around.

That's not as simple a question as you may think, Dwight. There are very few, if any, guitar amps that run in true Class A, with the exception of Single Ended (SE) amps such as the Champ or the Tweed Tone 12A (that I designed for Artist Guitars). Even Vox amps, which built their legend on being Class A, are not true Class A for their entire volumne range. I am not clear what you mean about phase distortion, so I will make up a "tighter" question for you. I assume you are referring to the Phase Inverter (PI), and then there are several parts toi the answer. If you mean can the previous stage overdrive and distort the PI, then the answer is YES. If you mean can the PI induce distortion in the 6V6's by overdriving them or inducing "blocking" distortion, then the answer is YES. If you are asking if the output of the PI still needs to be matched in level to maximise a clean signal, then answer is also YES. If you are asking if the 6V6s still need to be matched for the best and cleanest sound, the answer is also YES.

Take a look at my 3 part series of Amp Classes in particular: ua-cam.com/video/AQPWtCnulpU/v-deo.htmlsi=4C9d48lpGeUTVRrO and ua-cam.com/video/AQPWtCnulpU/v-deo.html

@@theguitaramptech thanks Chris. Dwight

Heineken Chris you're the expert I'm the hobbyist and amateur that's why I asked guys like you questions it's very nice that you have tried to answer my questions and I thank you for it I hope you don't mind if sometime I may ask you more questions you are a very nice man with a great deal of patience that's what I love about people like you you are willing to answer or try to answer my dumbass questions thank you Chris from the bottom of my heart sincerely Dwight

You sound like such a nice fella, Dwight, I am happy to answer your questions.

OMG. I didn't relise that I didn't link Part 3 to Parts 1 and 2. THANK YOU!! Part 3 is turning the jargon relating to amp Classes, specifically Class A, into a real amp that I designed . Here's the link ua-cam.com/video/AQPWtCnulpU/v-deo.html

That is the nicest comment I have ever had. Thank you.

Good work! I was just tweaking my Marshall 18w 1974 and recalled that my first Weber is now doing magnificent service in its 25th year and 5th amp. Our Webers are "keepers". :)

Good thought Dwight, but NO. Please don't. If the death cap shorts it will still connect Active to the chassis. This can lead to serious health issues!! If you insist on using a LINE TO GROUND capacitor, like the Death Cap, then you MUST replace it with a Class-Y safety capacitor that is designed to fail OPEN which may save your life one rainy day. (A Class X is designed to fail SHORT, while a normal Death Cap is to fail "whichever way chance takes it".)

Thank you Dwight. I think by now you know that I love the USA and (most) Americans (except for that man in San Fransisco elevator that didn't like me soley because I was an Aussie). You want proof of my affection for the USA? January will see my 33rd trip. This time for my 4th NAMM and short vaction. On my left arm I have a tattoo of a crucifix and the date Christ saved my daughter. On my right arm I have a tattoo of an American eagle. Now get back to doing some good soLder joints, and stop doing that silly SIDE WALK as you walk down the streets. Use the FOOTPATH instead. HAHAHA!

@@theguitaramptech I see that in you about my country. I like Australia as well. I always wanted to make a contact on my Ham Radio to Australia. Well I finally did back in around the year 2002. Mobile in my car I had a little Kenwood TS 50 Rig I used it from 97to2006 untill it broke down then I took it off the air. I had a Kenwood TS 850 SAT for a Base station. One-day in 2004 I made a contact to an older Gentleman in Melbourne Australia. I first tried with just the Exciter at 125 watts RF out. No contact. But then I turned on the linear amplifier all on single wideband with tuning up to 600 watts at 75 in and much adjustment I tuned back in to the frequency and gave them a call again There were 4 operators that night one in Melbourne Australia and Hawaii USA cook Island in the Pacific Ocean and New Zealand. It worked. I had a nice short contact. After about 5 minutes the opera In Melbourne called me back KC4ITU IS MY call. He said Well Dwight I recognized your name I used to know Dwight David Eisenhower back in 1950. Wow Chris my jaw dropped to the flore. Then I got Mike shy and failed to ask any questions and wished I did. What a fine old Gentleman. I'm glad to meet you out hear on YT as well I hope i'v made a friend With you Chris. Sincerely. Dwight.

One more comment Chris. I sent a message to Uncle Doug about one of his vids mentioning you in that message. Part of his reply to me was to send you his best regards from me thanks again Chris. Dwight.

I really have the highest respct for Uncle Doug. I think he is an amazing teacher who goes to great effort to pass on his knowledge. I probably try to position myself somehwere between Uncle Doug (@UncleDoug) and Lyle Caldwell, (@PsionicAudio) for whom I also have much respect. If you haven't discovered (fellow-Aussie) Brad's channel, @BradsGuitarGarage , he is also excellent. Talk soon Dwight. Take care. Chris

Easy answer. I ALWAYS discharge. When your amp is powered ON use your Multimeter to find the highest voltage you can safely and easily access. Remember that spot. Make yourself a discharging tool. Mine has a 10w 100 ohm resistor shrouded in heatshrink As you will see in many of my videos I use yellow heatshrink so I will see it! I have forgotten to remove the discharging tool several times, so I have also put in an inline fuse. Since installing the fuse, I have never forgotten it again. If you are a gambling man, you can leave the amp off for 15 minutes in the hope that the manufacturer installed a drain resistor, or you can leave the Standby ON while you power off. Make a coffee, check that your Will is up-to-date and start working. ALWAYS discharge.

You are right, Matthew! We are spoiled for choice these days. Webers are my favourite and my customers love them, too. It's great that you have found your favourites. Yes, I like WGS, too. I have not heard Jupiters.

@@theguitaramptech WGS makes the speakers for the people at Jupiter Condenser, the boutique capacitor people. The biggest deal with those is the paper voice coil former options. It makes a rather large difference in tone. I really like the M10C-P and M12C-P models. I have the 10' in my '66 Super Reverb and the 12" in my Deluxe clone that I built. They're not any more expensive than a Weber either.

Thanks Les. Coil rub is a depressing sound because its followed by an emptying of your wallet. I am a big Midnight Oil fan and was lucky to see them several times through their long career.

You won't believe it but I just finished a 50w Bassman today and it sounded absolutely magic! Both are so good, but if I had to choose one it would be the versatility and the more practical volume of the Deluxe.

Yes, I recall hearing that, Tom. Another legend.

I have to say, the Weber family, including Ted himself, are just so friendly. I was hoping to meet his son, TA, at NAMM next January, but sadly he won't be going. One of these days!

Thanks mate. I really apprciate your positivity.

Thank you so much Sean.

I am very impressed with your amp work, Neville. You MUST reame it the NEVIPHONE!! Brilliant. I loved the lyrics of the Oils. SO much more substance tha "shake that ass, bitch", or "You said that you loved me...but you lied".

Thank you kindly, good sir.

I love Webers, as do my customers where I installed them.

HAHAHAHAHA! I am now concerned about going to NAMM next January. Will I be walking upside down...or wil everybody else? Thank you for your kind words, dazz

Thank you, Ed. I'm with you on the Tele. My first "good" guitar was a Tele in 1975. After 50 years, every gig sees a Tele and Les Paul go with me.

I don't recall if I showed the plague of dry joints. They were doing my head in. In the end the only way was to suck out all of previous Techs solder and replace it with quality solder.

HAHAHA! More everything coming you way, my friend.

Thank you, kind sir.

Hi Christian. The OEM Fender Eminance speakers are too cheap to bother with a recone. I have some other beautiful speakers that I will video the recone process. TRhank you for the suggestion.

Thanks Mike. I am so glad that you are still enjoying your Princeton. Stay well. Chris

Give it a go, Yeatzee. Most clients like that bit of extra flexibility

It sounds amazing! I will upload the final video Saturday morning (Sydney time)

Oh but wait for the new speaker! It sounds amazing, Ed!

@@theguitaramptech Cool, look forward to the sounds maestro..! 😎

That's excellent feedback, Les. That's exactly the degree of difficulty I want to pitch my videos.

Thank you for your kind words. I think you will approve of the new speaker and the result.

Thank you, Peter

Have you replaced V2? Check the operation and power supply for the relays K2 and K1.

Thanks Nevile. I'm still not sure why his soldering was so bad. Maybe it was technique (I always tin EVERY component before soldering) or maybe crap solder.

@@theguitaramptech Yeah I dunno either. But I promise you, in 30 or 40 years I have never had something I've built, fixed or worked on, ever come back faulty cos of a dry joint. Just do it properly in the first place! Concentrate on the solder joint you're doing! Get that that right then you never have to go back to it. It's 60% lead ffs! It would normally need a century for anything environmental to even have a chance penetrate that connection! Let alone individually tinning component leads!

Correct! Everone needs a Junior

It was!

Does the amp blow fuses with the power tubes out? Check the rectifier diodes. Remove the preamp tubes (from memory, they use DC heaters).Check the voltage regulators. Good luck

An excellent place to start. I liked the Journeyman album a lot. His songwriting got so much better.