Gora Euskal Herria!!! Ia egunen baten topatzen garen Krakenak fardatzeko! jaja (nik V4 kraken-a daukat pedal forman) bueno... "corona"-k uzterik badauka!

Thank you Wendell for the kind words, we hope you enjoy your new Victory amplifier when it arrives! Thanks Victory

Thanks Phil, Happy to hear you are enjoying the Super Kraken! Cheers Victory

Jim R Not nerdy enough.I like to know which brand of preamp tubes they use.I can see that the power tubes are JJ,s but what about the preamp!Are they just"standard Chinese"or what?

@@rorycunningham5457 Yes, I agree!!! I don't understand when a top notch company puts shitty preamp tubes in a $1,000 plus amp.

Ian Abraham that video does exist..

Look at a hand-wired circuit. That is art to me.

Caps has a sound signature and often the Orange caps are used in Fender type circuits. Normally not in Marshall and other more driven amp types.

Chris Drake what's up? Small world. Lol

Normally the MV is placed after the preamp, before the phasesplitter. Then you can drive the preamp only, into saturation. If you place it later, after the phasesplitter you also drive that into saturation, before it reaches the power amp. Theoretically that last solution is not quite right, but I am not sure if it has any real disadvantages. Matchless has done that a lot.

I think the reason is because you need a dual-ganged potentiometer, so two pots of the same resistance attached together, for each output of the phase splitter. They're expensive & not always of exactly the same value so you need to be careful with selecting components. Especially if you like power valve saturation then where you put that master volume doesn't make an enormous difference when it's still the preamp you're saturating

HedCrub is correct, with regard to the V40; however, it should be noted that the answer to such a question depends on the design of the amplifier being discussed.

Aren't the old Sunn amps solid-state?

Have you replace the power tubes yet? With regular use they last about one year.

Working on that now. Replaced preamp 12ax7A tube with a 12AX7 and she opened right up. Doing phase inverter next, then getting a tech to do the the 6550's and bias them. Amp seems to break up early (may go back to a 12AX7A), and the tone gets weak and spongy dimed out. Original GE power tubes when I got her, so I'm guessing that's the issue. I see 4 modern caps in here, but I'm prob going to shotgun the rest when I get time. From what I've researched, the phase inverter is the life blood of this circuit, and potentially makes a huge difference. 6AN8 NOS as they are out of production now. It's an "oldy but moldy", but I at least got her doing some stonerdoom with a Digitech Bad Monkey, DOD Boneshaker, and an EQD Acapulco Gold. Slow and low is how I roll. : )

Hi Elliot, the preamp valves are also fairly easily accessible from the back of the amp, too. Having the amp upside down might help when changing valves. I hope that helps. Victory!

It would seem that V2 is the effects loop buffer: one triode for the send, and the other triode for the return. Some phase inverter circuits only need one triode, however, hence V2 could include a recovery stage (to offset the insertion loss of the tone stack [i.e. EQ]) and the effects send buffer (in which case, V3 would include the effects return buffer and the phase inverter).

These covers have the task to shield the inside of the valve from electromagnetic interference from sources in your room or on the stage ( like radio waves). I think it acts like a Faraday-Cage. If you remove the cover the tube is more likely to amplify signals besides your guitar signal from unwanted sources hence you'll experience more hiss and more noise. Usually it's enough to cover the input valve (V1) since it's the first stage of amplification and every unwanted noise that gets amplificated there, will just get more amplified in the whole circuit after that.

Blue glow?The heaters in mine all glow warm orange with only a faint light blue from the power stage visible in the dark.Pre-amp stages really shouldn't glow blue. That also applies to the hateful practice of fitting an LED under a valve...Blue normally signifies some residual gas the getter isn't capable of absorbing. The electrons strike the gas molecules, the molecules show their pleasure with a blue smile.

Richard Harrold First of all the blue glow only comes from Power tubes (that is the excess nutrons hitting the glass) Secondly, the preamp tubes are responsible for amplifying the signal in the front part of the amp before the heavy lifting is done by the power tubes. So the signal to noise is most impressionable here And belive it or not most if not all tubes are indeed microphonic so to cover them is to attempt to keep down the noise , an amp ,a guitar amp,takes a major beating each and every note played. They need to be build not only tank like but still being musically intergreious.

Tube and valve refer to the same component. In the UK they are referred to as 'valves' in line with their electronic function rather than their appearance.

Hallelujah!!!!

Indeed, when in that part of the world they say VALVE , and on the other portion on the globe we reffer to them as Vacuum tubes . Valve tube king

Why do we call them valves this side of the pond? Never really understood that.

Not an expert here, but it is my understanding that a lot of early work was done by an English chap whose name escapes me. 'Vacuum tubes' were already known, but he picked up on the valve-like property of the current only flowing one way from the filament to the anode.

MrDblStop Indeed sir, the mechanics of the tube acts just as a valve allowing and controlling the flow of electrons (current) !! Thats it exactly! They we revolutionary when they came out. I think they still are really cool. I mean all things technology speaking continue to improve or head a certain direction anyway but tubes or vavles are bad ass!!! To this day the most expensive stereos are tube powered i mean like 10 thousand dollars and more!! They cant replicate the naturally forming harmonics and overtones that the valve possess

Except they sound like a shit sandwich

The Roland Blues Cube Hot is a fantastic tube sounding solid state amp. Far from a shit sandwich.😎

Plug into a great ac30 or deluxe reverb then get back to me, it's night and day

I have, have to play it loud to have the tube saturation sound great. The Roland gets me there at a lower volume. Tube amps can't do that

Have you ever tried the Roland Blues Cube Hot? I was sceptical until I played one.

Darren C No that is a myth. Only type of glass you should not touch is quarts halogen lamps. The oils from your skin will cause a hot spot.Halogen lamps run very very hot. Tubes do not get hot enough for any oil from your hand to cause any negative effect.

GlenGH that's interesting a lot of amp guys and info says to ware gloves. It says it on power tubes el34s. But theres tones of info taken for granted thats not correct. I think if martins happy to work without gloves who am i to argue