Author Topic: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion  (Read 8802 times)

Offline Shonver

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Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #15 on: May 27, 2009, 09:57:22 AM »
Just gooi... and duck! :D

What's the worst that could happen?
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Offline Mars

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Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #16 on: May 27, 2009, 10:24:13 AM »
Hi All

This topic is close to my heart: How to enter this magnificent world of (tube) audio DIY. I do not think I have the answers... but I can tell more of how I got into the buzz of building my own tube amps. But my situation was unique:

I had a repair shop and people dragged in tube gear for me to look at all the time.
I lived in JHB and had access to Fitzers (what a gold mine of parts at giveaway prices).
I was nosy, and if I saw something curious (not the girl in the red dress; I mean the dusty chassis lying in the corner of the store room) I would ask about it.
And when I visited Wim (Mr Valve) for spares, I would buy a tube PA for a R150 or so, and get a transformer too ;D

My first amp was dreamt up one  night, and it came with a few limitations:

1.It had to be build it over one weekend, so I could listen to it during the week while I was busy do paying work.
2.The parts had to be in the shop already
3.R0 budget

I succeeded in building a Single ended stereo amplifier on a cut off steel chassis that performed remarkably well. I never looked back.
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Offline ghostinthemachine

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #17 on: May 27, 2009, 11:06:42 AM »
What's the worst that could happen?

Ol' Dewald can be WRONG, again... and be branded as a LOOSE CANON, again... or even worse, called "THE OUKE WITH A ... uhhm, lets leave it there shall we?  :-[

Paranoid? You betcha!
Hi-Fi is what YOU make of it. See my Facebook page: https://www.facebook.com/dewaudioza & my YouTube Channel: https://www.youtube.com/channel/UC1YZJWgrGwdCYSyGP8JEd7Q

Offline ghostinthemachine

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #18 on: May 27, 2009, 11:36:17 AM »
I have started a new and fresh thread here: http://www.avforums.co.za/index.php/topic,2931.0.html
Hi-Fi is what YOU make of it. See my Facebook page: https://www.facebook.com/dewaudioza & my YouTube Channel: https://www.youtube.com/channel/UC1YZJWgrGwdCYSyGP8JEd7Q

Offline Ampdog

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Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #19 on: May 28, 2009, 01:06:45 AM »
I lived in JHB and had access to Fitzers (what a gold mine of parts at giveaway prices).

Ah yes! What good memories does that bring back (to be off-thread for a minute). He had EVERYTHING there, I swear several hundred boxes, and he knew where everything was. .....
Audio must be the only branch of engineering where lack of basics' knowledge is considered a superior form of wisdom. (Anon)

Offline Ampdog

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Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #20 on: May 28, 2009, 01:13:04 AM »
I have started a new and fresh thread here:

Ghostinmac,

We have two rather similar threads now, which are soon going to lead to duplicating; you cannot talk about a valve without soon showing amplification, and you cannot talk about an amplifier without mentioning valves. How do you propose to treat this?
Audio must be the only branch of engineering where lack of basics' knowledge is considered a superior form of wisdom. (Anon)

Offline ghostinthemachine

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #21 on: May 28, 2009, 08:23:25 AM »
Ghostinmac,

We have two rather similar threads now, which are soon going to lead to duplicating; you cannot talk about a valve without soon showing amplification, and you cannot talk about an amplifier without mentioning valves. How do you propose to treat this?

Mr Ampdog... first we need to discuss the bare basics - HOW A TUBE FUNCTIONS... then we can get into push-pull topologies etc...

This very thread has gone a bit astray anyway...
Hi-Fi is what YOU make of it. See my Facebook page: https://www.facebook.com/dewaudioza & my YouTube Channel: https://www.youtube.com/channel/UC1YZJWgrGwdCYSyGP8JEd7Q

Offline ...

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #22 on: May 28, 2009, 10:15:52 AM »
We can get the basics from here :



So don't keep us in suspense.

I would like to know how this works and who will custom make a plate for this:





Offline ghostinthemachine

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #23 on: May 28, 2009, 07:53:25 PM »
I doubt these "For Dummies" books... you have to be really lacking in the intellectual department to read those.

Do you get a "Dummies for Dummies" book?  ???  ;D

and Analogos... a plate for your giant tube... use a silver butter dish! Remember, it must be silver...
Hi-Fi is what YOU make of it. See my Facebook page: https://www.facebook.com/dewaudioza & my YouTube Channel: https://www.youtube.com/channel/UC1YZJWgrGwdCYSyGP8JEd7Q

Offline ludo

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #24 on: May 29, 2009, 02:28:50 AM »
Analogos, at the risk of showing my complete ignorance here: What is that thing?

If it 's going vrot, put it on the buffet ! - Fats

Offline Ampdog

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Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #25 on: May 29, 2009, 04:21:18 AM »
It is a NUforce type of tube.
Audio must be the only branch of engineering where lack of basics' knowledge is considered a superior form of wisdom. (Anon)

Offline ludo

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #26 on: May 29, 2009, 04:35:46 AM »
It is a NUforce type of tube.

Cryptic at the crack of dawn, Ampdog.

So lemme see... if NU=No Use, and it's given NU(force) from which I derive SAPS, then it's an emergency vehicle flasher, used in the transportation of VIPs exclusively.

Am I on the right track?

If it 's going vrot, put it on the buffet ! - Fats

Offline ...

Re: Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion
« Reply #27 on: May 29, 2009, 05:55:29 AM »
Ludo
It's nothing actually, just a gigantic non working vacuum tube made from some spare computer parts with the yellow wires showing off the glow  ;D
I thought it would go well with my book.