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Old 22nd December 2011, 05:54 PM   #11
M Gregg is offline M Gregg  United Kingdom
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Don't want to put you off building an amp,

However if you have no electronic or electrical experience, the chance of a first time build with "0" faults is slim..

So do you have someone who can help you build?

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M. Gregg
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Old 22nd December 2011, 05:55 PM   #12
limono is offline limono  United States
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Sounds like PP with worn out output tubes Buy Dynaco ST 70 , at least you won't have any troubles selling it back for the same money (mine actually isn;t wooly at all on my speakers but it sounded that way on friends supposedly quite efficient 92db kef 104/2) or old ASL (Antique Sound Labs) had this tick signature , at least mine KT88 version is little warm sounding but very spacious. Trouble is the quality of these units was questionable and that's why they are fairly cheap for what they offer. Be advised that speaker/ amp interface is of paramount importance and will dictate the end result.
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Old 22nd December 2011, 06:21 PM   #13
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I have built Class D amps,also built Pass B1 Buffer,
and have tons of soldering experience,also have a few Multimeters
I have also wired many preamp & pickups for Guitars & basses.
as I am a Luthier.
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Old 22nd December 2011, 06:26 PM   #14
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by bigaudioscotto View Post
I have built Class D amps,also built Pass B1 Buffer,
and have tons of soldering experience,also have a few Multimeters
I have also wired many preamp & pickups for Guitars & basses.
as I am a Luthier.
If this is the case then read the safety section on this forum...

Remember that you must test before you touch anything fit bleeder resistors to the PSU caps..you may not get a second chance...

Now your on your way...to hopfully a great project..

Have a look at what you can afford to build and post your ideas..
You will get loads of help!

Look at the photo gallery also...


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M. Gregg
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What is the sound of one hand clapping?

Last edited by M Gregg; 22nd December 2011 at 06:30 PM.
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Old 22nd December 2011, 06:32 PM   #15
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Thanks for all the Feedback.
I just thought the Tubelab Simple Se
looked like an easy build,but if it does not give me the
punch and bottom I like I am sure I would not keep it.
so I don't know which way I will go,I would probably
prefer Push Pull but I know they are more complex to build.
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Old 22nd December 2011, 06:38 PM   #16
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by bigaudioscotto View Post
Thanks for all the Feedback.
I just thought the Tubelab Simple Se
looked like an easy build,but if it does not give me the
punch and bottom I like I am sure I would not keep it.
so I don't know which way I will go,I would probably
prefer Push Pull but I know they are more complex to build.
There is more to this than easy to build..

The noise rejection is better on PP so the PSU is "less critical" ie you can get away without a choke...

PP output Tx's can be smaller..

I'm not saying this is the way to go but do a search for baby huey..link:
First time baby Huey amplifier build

It will give you an idea of how a project can be done
I would price up a project for all parts before starting it!

Regards
M. Gregg
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What is the sound of one hand clapping?

Last edited by M Gregg; 22nd December 2011 at 06:41 PM.
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Old 22nd December 2011, 06:44 PM   #17
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hey, go over to shannon's website diytube.com :: Index - you'll find a couple of projects there from the ST35, ST70, etc

and bottlehead.com has plenty of kits for beginners.
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Old 22nd December 2011, 07:33 PM   #18
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Quote:
I don't know which way I will go,I would probably
prefer Push Pull but I know they are more complex to build.

The SSE or any single ended amp can make decent bass IF the output transformer is big enough AND the speakers have a reasonable impedance curve in the bass region. Many speakers will have a rather high impedance near the resonance of the woofer making the speaker hard to drive from a tube amp. I have an SSE using the same transformers that when connected to my Silver Iris speakers make solid bass that can be heard inside the house across the street. These speakers are 15 inch coaxial drivers with a 96 db efficiency. The same amp connected to my Yamaha NS-10M Studio monitors is a bit weak in the bass department since the speakers are about 25 ohms at 70 Hz.

Another possibility is the Simple P-P. It is a push pull amp using EL84's that delivers about 15 WPC. It uses a small amount of negative feedback to improve the bass into typical speakers.

True the SPP is a more complicated build, but both are PC board construction so the level of build complexity is about equal, and so is the total amp cost.
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Old 23rd December 2011, 01:27 AM   #19
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Lot's of good options have been presented. Naturally, I'll grind my own axe.

Build an "El Cheapo" with triode/ultralinear (UL) mode switches. The reasonably efficient open baffle speakers will produce "bleeding ear" volumes for heavy metal, etc., in UL mode. Triode mode offers greater finesse, for jazz and classical.

The attached schematic (triode mode) shows 12AQ5s, but any 6V6 family tube will work, without parts value changes. Please notice that a line stage is unnecessary. Use good O/P "iron", like Dynaclone Z565s, and full bass extension is available. Simply change the bandwith limiting combo at the I/P from 56 nF./100 KOhms to 68 nF./127 KOhms (RN65).

Jim McShane is the man for tubes and parts. Well under $100 buys a full set of power magnetics (will list if interested) from Allied.
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Old 23rd December 2011, 04:14 AM   #20
ke4mcl is offline ke4mcl  United States
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if you have no experience working on tube gear i would not recommend your first project be to build an amp. if you REALLY have a relentless need to work on a tube amp i'd suggest buying a magnavox stereo console amp and rebuilding it. they are very simple to work on and can be found SE or PP. there is substantial documentation on the yahoo groups called magnavox friends.

once your done with it you will have learned a bunch and wont have any trouble getting back what you paid.
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