Making Guitar Amplifiers

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Jon Beck

Trad climber
Oceanside
Sep 1, 2016 - 06:57pm PT
The Carver Amp Challenge

http://www.stereophile.com/content/carver-challenge#XW5D2OOxMSMfazFk.97

Of course I would rather listen to vinyl, do not ask me why.
ionlyski

Trad climber
Kalispell, Montana
Sep 1, 2016 - 09:03pm PT
Amen and kudos to analog. All the way baby!
zBrown

Ice climber
Sep 1, 2016 - 09:31pm PT




Ksolem

Trad climber
Monrovia, California
Sep 1, 2016 - 10:06pm PT

tubes


NutAgain!

Trad climber
South Pasadena, CA
Sep 2, 2016 - 12:59am PT
18W Marshall that you can crank without making your ears bleed sounds good! You gotta do some youtube style trip reports in the end :)


Edit: Ksolem, are those blue can-looking things electrolytic capacitors? If so, they are the biggest I've ever seen.
EP

Trad climber
Way Out There
Sep 2, 2016 - 04:37am PT
I use one of the following: 1958 Fender Tweed Deluxe with ancient tubes, Victiria Tweed Deluxe with NOS TUBES, and currently a Hughes and Kettner Bluesmaster with whatever they put in it new in 1995. I run the H&K through either a Jensen MOD12" in a strange looking old cab reminiscent of a drive in movie speaker or a pair of Celestion Greenbacks. The Vic has a 12" Jensen and the Fender a 12" no name. I get my beef from a Zendrive pedal. if I want cleaner tone I use my Dan Armstrong cabs with Cerwin Vega speakers: open back 12" or the closed back 15".

A friend who uses a Quilter tried to sell me his refinished'64 Strat for only $9,000. I passed.

Otherwise I play a Sonic Blue custom Strat clone, Old Melody Maker with PAFS, 58" Les Paul Jr., LapSteel from the 30's or, when the mood strikes me, a blue PRS SE with three Dimarzio Super Distortion Humbuckers, push pull pots for dual or single coils, six position pickup selector, OBEL, and on board preamp.


Ksolem

Trad climber
Monrovia, California
Sep 2, 2016 - 10:34am PT
Ksolem, are those blue can-looking things electrolytic capacitors?

Yeah. The designers at Manley Labs don't f*ck around.
bluering

Trad climber
Santa Clara, CA
Topic Author's Reply - Sep 2, 2016 - 12:28pm PT
Yeah. The designers at Manley Labs don't f*ck around.


Booyah! Capacitors are usually referenced in uF (micro Farads), because they usually don't get that big for most uses. But when serious filtering is required, you roll out the big guns.

We use ones rated at 47,000 uF, or 47 Farads. You never hear people refer to caps in 'Farads'. It always micro or pico Farads.

The ones in Kris' pics have got be around 50 or 100 'Farads'. That is about as clean a DC power source as you'll get. (The big guns are usually used to filter out ripple/noise from power supplies).

Jon Beck

Trad climber
Oceanside
Sep 2, 2016 - 12:46pm PT
47,000 uF, or 47 Farads

it would be 47 millifarads, 47 farads would be massive

uF is micro Farads (millionths of a farad)
Ksolem

Trad climber
Monrovia, California
Sep 2, 2016 - 03:25pm PT
Manley 500 Watt Monoblock

ALL-TUBE monoblock design 10 x KT90EH Electro-Harmonix Russian output tubes
High current double 12BH7EH driver stage
12AT7EH large plate Electro-Harmonix Russian input tube
BALANCED & UNBALANCED inputs
MUTE switch
TRIODE / Ultra-Linear switching
SOFT-START/ EVER-WARM standby mode
MANLEY Precision output transformer
Factory set for 5 Ohms nominal
Front panel bias measurement and adjust (hiding under the black insert)
Large filter / reservoir capacitors 3800uF x 2
Angled rear of chassis provides for easy connections
WBT binding posts
Input sensitivity: 1V
Gain: 32dB tetrode; 30dB in triode
Input Impedance RCA: 116 kOhm @ 1KHz
Input Impedance XLR: 270 kOhm @ 1KHz; 20 kOhms @ 20KHz; 38 kOhm @ 20Hz
Noise Floor: Tetrode: -67dB; Triode -65dB typical
S/N Ratio: -80 dB
Dynamic Range: 96dB
FLAT frequency response: 10 Hz - 30 KHz continuous
Power Consumption: 30 Watts in "EVER-WARM"
Full power (tetrode): 500W
Full power (triode): 275W
Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.
Operating Mains Voltage changeable with power transformer re-wiring and fuse value change.
Mains Voltage Frequency:
Dims: W=19", D=13", H=9"
Shipping weight: 82 lbs. each
Specifications subject to change because they just might.

bluering

Trad climber
Santa Clara, CA
Topic Author's Reply - Sep 2, 2016 - 03:32pm PT
it would be 47 millifarads, 47 farads would be massive

uF is micro Farads (millionths of a farad)


I stand corrected. .047 Farad's.....Doh!!! I feel stupid.....

EDIT: Kris, that is the kinda sh#t I'm talking about!!! Make the best, groud-up.
bluering

Trad climber
Santa Clara, CA
Topic Author's Reply - Sep 10, 2016 - 06:47pm PT
Dr Sprock, you know where I live. See me when yer around. Aquarian is still here...

I'm all ears on yer beta. Still absorbing everything, but the sublities that yer talking about are EXACTLTY what I'm trying create. A really kick-ass custom amp. Or two.

Just got my first output xfrmr today. A Classic Tone - 166-1633. The other parts are in the mail.

My initial design does not have a pre-drive potentiometer. Just a single volume for the orverall gain. I need to do a bit more research on biasing tubes, and flooding my pre-amp section!!!

BooM!!!!


WBraun

climber
Sep 10, 2016 - 07:18pm PT
bluering

Here's a good one.

Years ago they did a test on speaker wire and the best audiophiles were used in the "Test"

The loon "best audiophiles" said they can hear the difference in the expensive speaker wire from the cheaper stuff, hahaha.

So they made them hear through the expensive wire and the other was 10cents a foot ac lamp wire.

They picked the cheap 10 cents a foot lamp wire every time over the horrendously expensive best audiophile speaker wire thinking it was the best audiophile speaker wire.

LOL, stupid audiophiles .......
bluering

Trad climber
Santa Clara, CA
Topic Author's Reply - Sep 10, 2016 - 10:36pm PT
Oh, I get ya, Werner. That's why I'm building my own sh#t. I know what really sweet tones sound like. More importantly, I know which frequencies are sweetest to my (and most others) ears. It just sounds nice.

The cool thing is that I have no rules if I'm not selling the sh#t. F*#king rules and regulations...

I'll update the thread with some schematic ideas soon. I may just let you have my prototype, Werner. Or the second one. I gotta make two, for comparisons.
Ksolem

Trad climber
Monrovia, California
Sep 10, 2016 - 11:57pm PT
LOL, stupid audiophiles .......

Audiophiles are a funny bunch. There are a lot of poseurs. There are also some who really know what they're listening to.

Interesting story. I worked as a mastering guy at a top LA place for about 12 years. My studio had Tannoy 215 main monitors. That's 2 15 inch drivers with Tannoy's trademark HF horn mounted concentrically in one of them. The 15's were not crossed over, like the classic UREI 215's both were full range. So those 15's were driven by a massive Audire Otez amp, the hf driver by a Hafler. Great sounding rig.

We always had people coming in wanting us to try this or that. One day a rep from Kimber Cable came through. I had that whole set up wired with Monster Cable and had never given a thought to changing it. So the guy came in when I was working on something, without a client present. He asked me if I wanted to give these new cables a try. The wiring is easily accessible, so he took a few minutes to change it out while I did some editing on the near-fields. When he was done I flipped back to the mains and just about fell out of my chair. What I thought was a damn good system had just gotten a damn lot better. No way was he taking those cables back.

So the cable thing isn't really a hoax. That said, the Kimber's I fell in love with weren't cheap, but they were a fraction of the cost of some of the stuff I see audiophiles drool over... Jeez, those fools will spend a grand on a phono cartridge.

Obviously I don't know sh#t about guitar amps... Carry on.
bluering

Trad climber
Santa Clara, CA
Topic Author's Reply - Sep 11, 2016 - 12:24am PT
Obviously I don't know sh#t about guitar amps... Carry on.


You are the sound guy. And I know you know what I'm talking about.

It gets deeper with guitarists. Especially guys like me who dig the old warm tube sound. I even miss the Dick Dale spring-reverb sound!!!

So sweet!

As a sound dude, I know you love the tubes.....

EDIT: Cables are about sound integrity. Often overlooked. If the signal is compromised at the input, or in it's signal path, even Jimmy Page would sound like a d#@&%e.

That's why I don't like wireless rigs. Not real.
Dr.Sprock

Boulder climber
I'm James Brown, Bi-atch!
Sep 11, 2016 - 02:07am PT
Manley? there alright, licensed the Pultec stuff, smart move, AES regulars, Eve Anna rides a chopper so don't mess with her,

Vari-Mu compressor? very popular, modeled after the famous Fairchild 660 and and 670 (Rein Narma, George Alexanddrovich), used to feature the infamous 6386 remote cutoff, probably switched to a T bar 5670,

output transformer?
features a close coupled tertiary wind to prevent phase angle from causing oscillation, probably done on a fat stack of 80 Ni,

http://www.aes.org/historical/oral/?ID=54





Ksolem

Trad climber
Monrovia, California
Sep 11, 2016 - 10:10am PT
Sprock, what's your deal, you are very knowledgeable. You a studio guy? Ever go to a Sapphire Group get together? Kinda stodgy, but a good place to catch up with EveAnna and all the tube-heads.


This was my desk for more than a decade. Those are the 215's in the wall I was telling Werner about.

Analog on the right: Focusrite eq, Manley vari-mu, Manley passive eq (Magic that one is). That thing under the desk with two lights is a Manley D to A with a tube output stage.

OT I know, back to guitars. I'll learn something listening to you folks.
aldude

climber
Monument Manor
Sep 11, 2016 - 10:48am PT
Kris....what brand are the wonder cables?
Ksolem

Trad climber
Monrovia, California
Sep 11, 2016 - 01:19pm PT
Kris....what brand are the wonder cables?

Kimber Kabel. They make cables from around $200 up to about $10K :-0

I'm pretty sure these are the closest current model to the one's I used. Of course we didn't pay a dime for them, the rep wanted them to be seen/heard in our joint.

Kimber_Kable_12VS_Pairs
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