help finding a good amp project?

confused · 18th April 2004, 03:27 AM

Hi guys new here,Can someone direct me to a really good high power tube amp project that is fairly cheap to build?somthing that is good with 4ohm loads and an a and b channel to run a total of 4 speakers at times.
thanks for the help in advance

Mike.

SHiFTY · 18th April 2004, 09:17 AM

Try a 2 channel KT88 push pull (about 100W per channel). Use output transformers that have 4, 8 & 16 ohm taps.

If you need to use 4 speakers, you can wire two pairs of speakers in series and connect to the appropriate tap, eg two 8ohm speakers in series connected to the 16 ohm tap.

confused · 18th April 2004, 02:18 PM

alright that sounds good the kt88's are well priced too if i can rember correct?I didnt think they worked well at the higher power but cool that should get me started.Thanks

Mike.

Eli Duttman · 18th April 2004, 02:58 PM

A push pull pair of KT88s is good for 50- 60 W. For an amp in the 100-120 W. range, you need a quad of KT88s in parallel push pull. O/P transformers that handle the power in question are always costly.

BTW, wiring 2 pairs of speakers in series is not a good idea, unless the 2 pairs are "identical".

confused · 19th April 2004, 04:35 PM

Great suggestions so is there somewhere I can go to find some good plans to build one of these?I cant wait to get the amp going bacause my new mtm diy 4ohm speakers are nearing completion and I will need a new amp to run em thanks again

Mike.

Eli Duttman · 19th April 2004, 07:00 PM

Mike,

Do you know what the impedance curve of your nominal 4 Ohm MTM speakers looks like? Speakers with significant dips in the impedance curve, particularly in the power hungry bass region, are poor candidates for mating with tube amps. If your MTMs were nominally 8 Ohms, connecting them to the 4 Ohm taps is way to deal with impedance dips.

pingfloid · 19th April 2004, 07:04 PM

100W with KT88:
http://www.triodeel.com/gec100w.gif

400W with KT88:
http://www.triodeel.com/gec400w.gif

Good luck!

18th April 2004, 03:27 AM	#1
confused diyAudio Member Join Date: Mar 2004 Location: calgary alberta canada	help finding a good amp project? Hi guys new here,Can someone direct me to a really good high power tube amp project that is fairly cheap to build?somthing that is good with 4ohm loads and an a and b channel to run a total of 4 speakers at times. thanks for the help in advance Mike.

18th April 2004, 02:58 PM	#4
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	A push pull pair of KT88s is good for 50- 60 W. For an amp in the 100-120 W. range, you need a quad of KT88s in parallel push pull. O/P transformers that handle the power in question are always costly. BTW, wiring 2 pairs of speakers in series is not a good idea, unless the 2 pairs are "identical". __________________ Eli D.

19th April 2004, 07:00 PM	#6
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Mike, Do you know what the impedance curve of your nominal 4 Ohm MTM speakers looks like? Speakers with significant dips in the impedance curve, particularly in the power hungry bass region, are poor candidates for mating with tube amps. If your MTMs were nominally 8 Ohms, connecting them to the 4 Ohm taps is way to deal with impedance dips. __________________ Eli D.

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18th April 2004, 09:17 AM	#2
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	Try a 2 channel KT88 push pull (about 100W per channel). Use output transformers that have 4, 8 & 16 ohm taps. If you need to use 4 speakers, you can wire two pairs of speakers in series and connect to the appropriate tap, eg two 8ohm speakers in series connected to the 16 ohm tap.

18th April 2004, 02:18 PM	#3
confused diyAudio Member Join Date: Mar 2004 Location: calgary alberta canada	alright that sounds good the kt88's are well priced too if i can rember correct?I didnt think they worked well at the higher power but cool that should get me started.Thanks Mike.

19th April 2004, 04:35 PM	#5
confused diyAudio Member Join Date: Mar 2004 Location: calgary alberta canada	Great suggestions so is there somewhere I can go to find some good plans to build one of these?I cant wait to get the amp going bacause my new mtm diy 4ohm speakers are nearing completion and I will need a new amp to run em thanks again Mike.

19th April 2004, 07:04 PM	#7
pingfloid diyAudio Member Join Date: Jan 2004 Location: Bangkok	100W with KT88: http://www.triodeel.com/gec100w.gif 400W with KT88: http://www.triodeel.com/gec400w.gif Good luck!

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