Jump to content

Entry for July 2019's Guitar Of The Month is now open!
ENTER HERE

Sign in to follow this  
bond163

Prefered Amp?

Recommended Posts

Check out the 18 watt clones.  There is a forum dedicate to 18watt builders.  Those are killer sounding amps.  Tons of info, schematics and support by folks that are in the same mess.  Google it, I can't remember the site name.

Do the 18 watt amps have the signature early marshall tone? I've never gotten my hands on one to try it out.

Some day I'm going to go crazy and build myself a 1x12 combo with one input switchable between tweed champ electronics for clean and a low-power gain amp for dirty (which is why I'm asking about the 18 watt, it's an ideal candidate).

I've never built a guitar amp before, but I've built several hi-fi audio amplifiers, so I ought to be able to manage it without killing myself :D.

Share this post


Link to post
Share on other sites
...ok lol i respect you but, i can easily get stuff from an electronics wholesaler...
B) And I'm not disrespecting you, but if you make an amp out of those parts with that switching power supply, it may well sound great (or not - who knows?), but it won't be a Marshall (not even close) - details are kinda important. By all means, do as you wish, and best of luck to ya. :D Keep yer fingers away from that switcher! :D

Share this post


Link to post
Share on other sites
Check out the 18 watt clones.  There is a forum dedicate to 18watt builders.  Those are killer sounding amps.  Tons of info, schematics and support by folks that are in the same mess.  Google it, I can't remember the site name.

Do the 18 watt amps have the signature early marshall tone? I've never gotten my hands on one to try it out.

Some day I'm going to go crazy and build myself a 1x12 combo with one input switchable between tweed champ electronics for clean and a low-power gain amp for dirty (which is why I'm asking about the 18 watt, it's an ideal candidate).

I've never built a guitar amp before, but I've built several hi-fi audio amplifiers, so I ought to be able to manage it without killing myself :D.

I've never gotten my hands on an 18watter.. it's supposed to be super vintage vibe though.. I've listened to a ton of clips from folks that built theirs. www.18watt.com is the site.

I have a fender pro jr.. 2 84s, one ax7 and 1 at7 maybe? i don't remember..

Dude from www.eurotubes.com put together a package for me. Excellent price and the JJ tubes i absolutely love. I told him i wanted early breakup and a super tasty distorted sound and the combination of tubes he shipped me were dead on. It's only got a volume and a tone knob. Used to break up at 8 or so (out of 12) and now it gets gritty at 4-5. I just crank it to 12 and use my volume knob to go from clean to dist. It's a beautiful thing. 15 watts though and it's still loud as hell. I have a 6db cut attenuator that I made for it. That keeps the peace. :D

Share this post


Link to post
Share on other sites

So out of a choice of Tubes:

# Sovtek EL34WXT

# Electro Harmonix EL34 EH

# J.J. EL84 Tesla

which are better? Sovtek 12AX7 or Mullard 12AX7

Share this post


Link to post
Share on other sites

hmmm

ther not el34... but i can prob get JJ el34

and can anyone garauntee me that el34 are used in JCM800 master volume?

in the better of the circuit diagrams, all thats written next to the main valves is the voltage in 480 ...

Share this post


Link to post
Share on other sites

You've forgotten input/output jacks, a standby switch, a fuse and holder, and a pilot light. That's assuming you've made arrangements to build a board and a chassis, and already have all the parts for the power supply. And why do you need 6 12AX7s and sockets? :D

Share this post


Link to post
Share on other sites

because i need 6 12ax7's

and whats the pilot light for?

i am gonna build a 20w valve first before this, but i'm gonna order all components at the same time. i've only built solid state before ....

Edited by bond163

Share this post


Link to post
Share on other sites
i've highlighted the 6 12AX7's
:D No, what you've highlighted is 3 12AX7s - the 12AX7 is a dual triode! And you also don't seem to understand that regardless of what you use for a power supply, you're still going to have to have a 100 watt output transformer if you're using 4 EL34s.

Your lack of understanding of basic tube technology worries me almost as much as your aggressive, "can't-be-wrong" attitude - I wish you the best, but I really don't expect to ever hear that you've completed this über-Marshall you've got planned. I strongly recommend a little less hubris and a lot more research before you unsheath your soldering iron - as always, free advice is worth every penny you paid for it, so feel free to ignore it, and be careful around the high voltage. Remember, air isn't nearly as good an insulator at 700 volts DC as it is at house current levels. Don't hurt yourself!

Share this post


Link to post
Share on other sites

thank you for clearing that up :D

i'm sorry if i've been rude

but generally i have an excuse for every mistake ....

in fact i generally all ways have an answer

and i've said this is my first time with tubes

thats why im building a 20w first ...

and i know 700v can kill me (after many zaps when little from points i know what 240v feels like ...)

Share this post


Link to post
Share on other sites
:D No worries! I'm not your mom, so I'm not going to tell you how to act - I just want to make sure you know what you're getting yourself into before you get a bunch of money and time tied up in a huge project that you can't possibly complete, and that might potentially prove fatal if you're careless. Been there, done that - it sucks! :D

Share this post


Link to post
Share on other sites

well the original Power Transformer was

340-0-340

around 200ma

6.3VAC IOut

so i'll work out the cost of modifying a pc powersupply against a $200 transformer ....

and hope i can put in a few less turns when re-winding the transformer

to produce 375volts

Share this post


Link to post
Share on other sites

If it helps, I think most old school EL34/6550 Marshalls ran the plate voltages between 420 and 480 volts, screens around 350-400 volts, but that's just off the top of my head, so don't quote it. And don't forget that you're going to need plenty of heater current to run a quad of EL34s.

Share this post


Link to post
Share on other sites

Like 7.5 - 8.5 amps for filaments ( a quad of EL34s will suck up 6 amps by themselves at 6.3 volts, and figure 300mA for each 12AX7, and add 10-20% for a safety margin), and between 200 and 400mADC for the HV supply (depending on yourvoltage, bias, etc.). 400mA at 450 volts works out to 180 watts, so you're covered there, so long as the psu can actually put out 200 watts. I'm really uncomfortable about loading high voltage switchers heavily, but it could just ne my age showing.

Share this post


Link to post
Share on other sites

well i found the perfect pedal :D

only prob will be that it will be a log as oposed to linear, which i hope wont make to much of a noticeable difference, but then again, i might make this type of pedal famous!!

p10100157xb.jpg

p10100172mj.jpg

i'm also begining construction of a: big muff, sustainer, distortion, solo boost (i'm gonna build a few different boosters), electric mistress and a fuzz with many knobs, a crybaby wah

Edited by bond163

Share this post


Link to post
Share on other sites

i still can't figure out why the heck you want a 200 watt amp!! Who are you trying to kill/torture..A 50 watter will blister any drummer and a 100 watter will play to any arena you might dream of playing in.. Besides.. if you get on stage you're just going to be mic'd and run through the house anyway.. If you are into vintage tone (judging by your pedal projects I assume you are) go for quality over quantity.. a good 30 - 50 watt unit will give you absolurely everything you need.

Check out www.18watt.com It's a whole community of folks that have finished their amps. They are a killer sounding amp, clones of the vintage 18 watt marshalls. There are 100 different variations and schematics.. you really can't go wrong there if you are careful. Although I would dare you to find anyone there that would agree with using a PC power supply.. those things are horrible. It's easily worth the money for a real output transformer over the time and headache in converting a PC one.

There is another site online that goes into detail on how to wind your own transformers if you are just looking for a project..

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...