Project choice for KT88

JDeV · 16th August 2005, 07:24 AM

I plan on building a "high power" amp using the KT88. Found the following circuits:

1) Which will be the better quality one to build?
2) Are there any other/better high quality circuit to use with this tube?

Jolida SJ-502a

Radford STA-100

Thanx for all assistance

georgehifi · 16th August 2005, 08:34 AM

JDeV, check out the circuit on my post (Very powerfull push/pull) it can use KT88 or KT90's and it kicks some serious butt.

Cheers George

JDeV · 16th August 2005, 08:44 AM

Hi george,
Which amp circuit is this and where can I get component values, trafo specs etc?

Family_Dog · 16th August 2005, 08:51 AM

Hi JdeV,

Here are a couple more for your consideration:
http://www.amplimo.nl/download/pubs/hqpp-50/hqpp50.pdf

The Power Supply may be found here:
http://www.amplimo.nl/download/pubs/...0/hqpp50ps.pdf

Then there's the Claus Byrith amplifier discussed here:
http://www.lundahl.se/claus_b.html

This last amplifier is based on the Mullard 5-20 (uses EL34 PP) and gives excellent results (I have built five of them!)

I also wish to construct something else now and I am looking favourably at the HQPP50W design above.

Hammond Output Transformers are locally available for all the above (JHB & CT) while the Mains Transformers can be manufactured by a Company such as Peter Souris.

Regards

-Eric

JDeV · 16th August 2005, 09:01 AM

Quote:

Originally posted by Family_Dog

Then there's the Claus Byrith amplifier discussed here:
http://www.lundahl.se/claus_b.html

This last amplifier is based on the Mullard 5-20 (uses EL34 PP) and gives excellent results (I have built five of them!)

Regards

-Eric

I know that one, build 2 myself about 3 years ago. Bussy at the moment to fit new PSU and high grade components to it. Got the urge to build something with the KT88, like the appearance of the valve

Remember this?

Old post - JDeV

georgehifi · 16th August 2005, 09:03 AM

Quote:

Originally posted by JDeV
Hi george,
Which amp circuit is this and where can I get component values, trafo specs etc?

The amps long gone and i don't have the values for it any longer but some of the brainiacs here may be able to calculate out the parts guys like SY and alike if their feeling bored. the tranies were one of the Hamond ones a 150 watter.
This amp put out somthing like 180watt in ultralinier, with a switch i had it in triode mode still up around 80.

Cheers George

Family_Dog · 16th August 2005, 07:27 PM

Quote:

Originally posted by JDeV

I know that one, build 2 myself about 3 years ago. Bussy at the moment to fit new PSU and high grade components to it. Got the urge to build something with the KT88, like the appearance of the valve

Remember this?

Old post - JDeV

Yep... that was a whikle ago.... have you looked at the other site I referred you to - the one with the HQ50PP amplifier? That uses KT88...

-Eric

16th August 2005, 07:24 AM	#1
JDeV diyAudio Member Join Date: Oct 2002 Location: Cape Town	Project choice for KT88 I plan on building a "high power" amp using the KT88. Found the following circuits: 1) Which will be the better quality one to build? 2) Are there any other/better high quality circuit to use with this tube? Jolida SJ-502a Radford STA-100 Thanx for all assistance __________________ "Be carefull who's advice you buy, but be patient with those who supply it." From Baz Luhrmann's - Everybody’s Free (To Wear Sunscreen)

16th August 2005, 08:34 AM	#2
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	JDeV, check out the circuit on my post (Very powerfull push/pull) it can use KT88 or KT90's and it kicks some serious butt. Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

16th August 2005, 08:44 AM	#3
JDeV diyAudio Member Join Date: Oct 2002 Location: Cape Town	Hi george, Which amp circuit is this and where can I get component values, trafo specs etc? __________________ "Be carefull who's advice you buy, but be patient with those who supply it." From Baz Luhrmann's - Everybody’s Free (To Wear Sunscreen)

16th August 2005, 08:51 AM	#4
Family_Dog diyAudio Member Join Date: May 2004 Location: North Western Province of South Africa	Hi JdeV, Here are a couple more for your consideration: http://www.amplimo.nl/download/pubs/hqpp-50/hqpp50.pdf The Power Supply may be found here: http://www.amplimo.nl/download/pubs/...0/hqpp50ps.pdf Then there's the Claus Byrith amplifier discussed here: http://www.lundahl.se/claus_b.html This last amplifier is based on the Mullard 5-20 (uses EL34 PP) and gives excellent results (I have built five of them!) I also wish to construct something else now and I am looking favourably at the HQPP50W design above. Hammond Output Transformers are locally available for all the above (JHB & CT) while the Mains Transformers can be manufactured by a Company such as Peter Souris. Regards -Eric __________________ Vintage Tube Hobby Group: http://groups.yahoo.com/group/vintage_tube/

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