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Old 3rd December 2001, 07:54 PM   #1
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I am wanting to build my own integrated tube amp that is (1)for beginners (2)inexpensive and (3)includes the case and everything. Does such a thing exist??

Brian
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Old 12th December 2001, 03:33 PM   #2
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Default Kits

Brian,
If you are not using a phonograph you can passively integrate any amp simply by putting a potentiometer(volume control) in the signal path between the RCA plug and the driver tube. If you are going to use a phonograph you will have to build a phono section which means the kit will not be that simple. Single Ended amps have a simpler circuit than Push Pull but have much less power so your speaker choice is much more important. If you are planning on building your own speakers as well you can buy your drivers to go with your amp. You also need to tell us what your idea of inexpensive is. Another thing is do you have the proper tools?
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Old 12th December 2001, 05:49 PM   #3
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As an addendum to what David said, smaller amps tend to have lower gain, which may not always be enough. Check the amp's sensitivity (how much voltage to drive it to full power) and compare it to your intended source.

Grey
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Old 13th December 2001, 03:53 AM   #4
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Smile Dang!

You try and cover it all and just look! We make a pretty good tag team there Grey. I do try and keep my head above water but if will find me drowning every once in a while, just bail me out.
Thanks,
David


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Old 13th December 2001, 05:03 AM   #5
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Doan' worry 'bout it. I'm a firm believer in drowning at least once a week. Flushes out the lungs.

Grey
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Old 13th December 2001, 12:15 PM   #6
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Default A 10 Watt Stereo Tube Amp

I thought I would use this thread instead of starting another for basically the same queston.

I have just been bitten by the full range driver syndrom, I can hear Walker, ThomasW, and Grey groaning now. Yes, it is a bit weak in the bass section, but.... You are hard pressed to find a smoother sounding speaker for those great jazz tunes. I could hardly believe my ears on the first cut where I heard a sax player climb the scale and there was no humps or dips in the response.

I found this pair of full range drivers in a disposed old console stereo! And so for kicks I slapped together an octagonal transmission line tuned for about 50Hz and dropped them in. I know this is so cliche, but I have been having a ball listening to them, about 5 hours straight. Unbelievable for vocals and jazz.

So I have decide to completely lose it, a I want to build a tube amp to drive them. I don't know the sensitivy of the speakers, but I can run everyone out of the room on about 2 watts according the power meters on my power amp. This will be my first valve amp and so I am looking for a simple, very simple, inexpensive, and sensitive amp to build. I want to drive the amp directly from a CD player and I will build a passive pre-amp or volume control into the amp. Again, fellas, this is to be a quick, cheap, and easy amp that will let me get my sea legs.

I wish I would taken the old Scott a friend offered me many years ago when I was a smart *** kid and thought that if you did not have at least 100 watts of solid state, you were still living in the past. If I only knew, he told me I would wish that I would have taken someday!!!

So, I am ready to start glowing in the dark!!!

Surf, Sun & Sound

PS. Walker, I just dropped a really good jazz vinyl on the turntable, so I must run. Hope you enjoyed tonights jazz segment on ABC. I missed it, because I was listening to too much music!!!
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Old 13th December 2001, 04:10 PM   #7
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I picked up some new Coltrane yesterday...
Your main expense is going to be transformers, both power and output. (By and large, an integrated amp is going to be too small a project for such options as OTL.) You'll need to figure out how much you want to spend, and start cruising for schematics that look like they might do what you want.
As with all amp projects, start from the back and work your way forward. How much power are you going to want? That will narrow down the choice of output tubes--there are really only about a half-dozen in common usage. (If you decide to go single-ended, you've got a different list of tubes to choose from.) The output tube will determine the output transformer (plate load). The input and driver stages will give you plenty of leeway to express your creativity (i.e. modify the thing out of recognition).
For the preamp stage, you can throw in just about anything you like, including the kitchen sink.
Oh, yeah, just for fun, keep in mind that a pentode output tube can be operated as a triode. Better sound quality but reduced power output.

Grey
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Old 13th December 2001, 09:12 PM   #8
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Default Can you point me to a schematic?

I have already picked 10 watts as a starting point. So can you point me in the right direction? I am extremely unfamiliar with tubes and do not know which ones do what.

I found this on the OZ Ebay - http://cgi.ebay.com.au/aw-cgi/eBayIS...ndexURL=0&rd=1 - check it if you would and let me know if it is a good unit to start with!

I would like to keep this an inexpensive project, because as you know the budget will always balloon to triple of what you expect. So of course I will need an amp that does not need to use any rare or hard-to-find tubes. So am I asking to much to build a simple tube amp for around $100. I know that you can spend 100x that if you want, but not yet. The speakers that I am going to use it with are not worth an expensive, tedious project. If this is a bit too optomistic, I may just put together another JLH 10 watt Class A to drive this speakers.

Johnny Coltrane?! I have yet to put him into my collection. My better half is not a jazz lover(but is a music lover), so I have to budget my music expenditures accordingly.

Surf, Sun & Sound
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Old 13th December 2001, 09:45 PM   #9
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I would like to build my own amp/preamp as well
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Old 13th December 2001, 10:37 PM   #10
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Sx3,
I dunno about the old amp. Stuff like that scares me, particularly when they say "as is." Keep in mind that you'd probably have to replace all the resistors and caps, too. The caps I wouldn't trust not to pop if they haven't been run in a while. The resistors are most likely carbon composition, which probably started at 10% tolerance, and has since drifted to 50% tolerance. (Carbon comp. resistors absorb moisture from the atmosphere, etc.--they just don't age well.) And the transformers...who knows? They might be good, they might not. Relatively speaking, that's what you'd be paying for, as the rest of the circuit is mostly obsolete parts at best.
Christine,
I'm assuming that you're wanting something smallish, yes? Fine tune me a bit as to where you want to go.
Both (assuming that Christine is headed in roughly the same direction as Sx3),
Poke around on the web looking for something with, say, a push-pull 6BQ5 output stage. That will put you in the range of 10-15W output. (What the 6BQ5 might be in European designation, I'm not sure. Christine, where are you, at least in terms of continent?) I'll try to scratch up a schematic or two if I have time this evening (I'm at work).

Grey
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