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Post subject: Re: Potential New Amp Build Thread
Posted: Sun Dec 23, 2012 7:08 pm
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DIY is a great project! Not only for the end-product --- but, also to describe strategies and topology philosophy in each section.

My opinion: A good PS is the foundation of all good amps!


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Post subject: Re: Potential New Amp Build Thread
Posted: Sun Dec 23, 2012 7:24 pm
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BMW2002Ti wrote:
DIY is a great project! Not only for the end-product --- but, also to describe strategies and topology philosophy in each section.

My opinion: A good PS is the foundation of all good amps!


I flunked philosophy in college.

Oh, wait. Maybe it was psychology. I don't remember. It was one of those "Ps". I know it wasn't phys ed. Wasn't required. :lol: :lol: :lol:

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Post subject: Re: Potential New Amp Build Thread
Posted: Sun Dec 23, 2012 8:05 pm
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I think that almost everyone excelled at college "phys-ed", if you know what I mean. Extra curricular activity of course. :wink: :D

My philosophy on Philosophy is purely philosophical. :lol:

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Post subject: Re: Potential New Amp Build Thread
Posted: Sun Dec 23, 2012 8:20 pm
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Yeah! Co-Ed Phys-Ed. :lol:


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Post subject: Re: Potential New Amp Build Thread
Posted: Sun Dec 23, 2012 8:30 pm
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Rock Star
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Shush! You want to get us in trouble with Brad? :lol:

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Post subject: Re: Potential New Amp Build Thread
Posted: Tue Dec 25, 2012 1:55 pm
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Aspiring Musician
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I vote go for it Bill. 8)

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Post subject: Re: Potential New Amp Build Thread
Posted: Tue Dec 25, 2012 5:49 pm
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No457 Snowy wrote:
I vote go for it Bill. 8)

Snowy


I plan on it. :wink:

Just gonna be a couple of months. :D

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Post subject: Re: Potential New Amp Build Thread
Posted: Sun Jan 06, 2013 7:52 pm
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Just ordered my kit from Weber tonight. Usually takes about 4 weeks to arrive.

Some clues as to what it is:

1. It is NOT a Fender based amp. :shock:

2. It is a head unit with two EL34s.

3. It will drive a 4x12 half stack.

4. It's about 50 watts output.

5. It's a high gain amp with a master volume control.

I'll identify it and start a new build thread when it arrives. 8)

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Post subject: Re: Potential New Amp Build Thread
Posted: Mon Jan 07, 2013 1:27 am
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JTM-45 clone?


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Post subject: Re: Potential New Amp Build Thread
Posted: Mon Jan 07, 2013 7:06 am
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Aspiring Musician
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I consulted with our friend Mr. Google and will venture a guess on the
Hughes & Kettner, Statesman Series STM Dual EL34 50W Tube Guitar Amp Head

Cheers!
BM

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Post subject: Re: Potential New Amp Build Thread
Posted: Mon Jan 07, 2013 3:50 pm
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There is no prize if you guess correctly, 'cuz I ain't tellin'. :lol: :lol: :lol:

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Post subject: Re: Potential New Amp Build Thread
Posted: Sat Feb 02, 2013 5:39 pm
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Rock Star
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Just got word from Weber that some parts for my new amp are out of stock. They hope to have them in another week or so. :(

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Post subject: Re: Potential New Amp Build Thread
Posted: Wed Feb 06, 2013 2:18 pm
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bluesky636 wrote:
modwiz wrote:
bluesky636 wrote:
I posted information on the preferred methods for draining the power supply caps in my BDRI mod thread.


I take that to mean it is bad advice. Thank you.


It is good advice only if you measure the voltage across the power supply caps after doing this. :wink:


I have always used my tool, a 1 watt 50K resistor with a short length of wire on each end, alligator clips (or similar and INSULATED) and completely insulated after i build them

i LEAVE the amp plugged in and OFF (only for amps with digital components) i hook one clip to chassis and the other to the HV caps first the pos side then the neg side...the reason it is a good idea to keep the amp plugged in BUT TURNED OFF in digital equipped amps...is simple..if you lift the wall plug out (meaning removing the grounding/earthing) and do ANY discharges of caps to chassis you will instantaneously raise the chassis to the level that you are discharging...it can blow digital stuff up...not an issue with all tube amps...but be careful you can die QUICK if you are not careful (difib machines ...whoa baby....you can lift one of them up with EMF if not careful

some simple precautions..use ONE hand to attach the clips..WEAR shores with dry rubber soles if you are on concrete..... you DO NOT want to crate a path through your body IE heart... (one handed, the other in your pocket not on your beer and no body contact with the chassis or wire/clips/caps

it only takes 5 millionths of a volt to stop or miss time your heart..i was a bio medical engineer in the early 80's....i know a bit about this stuff


BTW the chassis raising to the level you discharge....leaned all about that with 27,00+ volts

as did my boss at a LASER place that stuck a freaking weller solder gun into a 400amp 27000 volt power supply...he flew about 8 feet slammed his head on the wall and was white as a sheet and not right...in the head or body for quite a few days...he was damn lucky as i have been

once lifted by the explosion a TV chassis off a oak college lab bench in front of my students..it almost killed me...i felt my heart stop...the foci restarted it for me.

the critical timing period to avoid zapping yourself is during the re-timing of the P,Q,R,S complex specially the T wave..and the T wave is the most vulnerable...so if you zap yourself at the moment your heart is re-timing and regenerating the potassium flip to fire off the nodes...you die...or go down and someone brings you back


i was working on a famous bay area guitarist's Ampeg VT22...knocked me back about 3 feet into the shop wall...and it HURT

ya gotta be careful :shock: :shock: :shock: :shock: :shock:

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Post subject: Re: Potential New Amp Build Thread
Posted: Wed Feb 06, 2013 4:56 pm
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rollo wrote:
I have always used my tool, a 1 watt 50K resistor with a short length of wire on each end, alligator clips (or similar and INSULATED) and completely insulated after i build them


Pretty impolite to hijack someone else's thread with an off-topic post. :roll:

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Post subject: Re: Potential New Amp Build Thread
Posted: Wed Feb 06, 2013 6:15 pm
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rollo wrote:
...i LEAVE the amp plugged in and OFF (only for amps with digital components) i hook one clip to chassis and the other to the HV caps first the pos side then the neg side...the reason it is a good idea to keep the amp plugged in BUT TURNED OFF in digital equipped amps...is simple..if you lift the wall plug out (meaning removing the grounding/earthing) and do ANY discharges of caps to chassis you will instantaneously raise the chassis to the level that you are discharging......


Not only rude, but ludicrous as well. One side of the caps are connected to chassis (ground) and connecting a resistor from chassis to the positive side of the caps is a short circuit across the caps. Short-circuiting the caps discharges them, not into the chassis, but dissipated as heat through the resistor. Leaving the amp plugged in while discharging caps is insane. :shock:

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Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.


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