RH84 builder!

tim614 · 12th October 2009, 01:35 AM

Im trying to get a winter project going and i decided to build another RH84 amp but with 6v6. My question is, what needs to change on the rh schematic for 6v6?

tim614 · 12th October 2009, 03:42 AM

schematic

planet10 · 12th October 2009, 03:55 AM

At a minimum, you'll need to change the Cathode R on the output tube.

Maybe some optimization of the feedback R.

dave

tim614 · 12th October 2009, 04:18 AM

i do understand the bias need to be different between el84 and 6v6 but wasnt sure if there's anything else i need to know.

aardvarkash10 · 05:15 AM

read the tubecad article on this subject and the classic Schade article. You may also want to look at Shoog's recent postings on the subject.

Geek · 12th October 2009, 12:07 PM

Checkout "Anode Follower" or "Plate Follower", because that's what this type of amp is.

Cheers!

pointy · 12th October 2009, 05:03 PM

i would go for 250v for both the plate anode and the screen grid a very little bit under that.

it looks good on thd and you still get good watts also you can use the same opt

i think ?

pointy · 12th October 2009, 05:26 PM

you maybe able to push that up by 20v to 270v if i reme..................................

tim614 · 12th October 2009, 08:21 PM

Im planing to build 2 monos cause i have a pair of 275ct PTX @75ma and EDCOR 5K8OHMS OPTX so ithought RH6v6 should be fun to build.

12th October 2009, 01:35 AM	#1
tim614 diyAudio Member Join Date: Jun 2008	RH84 builder! Im trying to get a winter project going and i decided to build another RH84 amp but with 6v6. My question is, what needs to change on the rh schematic for 6v6?

12th October 2009, 03:55 AM	#3
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	At a minimum, you'll need to change the Cathode R on the output tube. Maybe some optimization of the feedback R. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

12th October 2009, 05:14 AM	#5
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	read the tubecad article on this subject and the classic Schade article. You may also want to look at Shoog's recent postings on the subject. __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012 Last edited by aardvarkash10; 12th October 2009 at 05:15 AM. Reason: typo's make my incoherent statements indecypherable!

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12th October 2009, 04:18 AM	#4
tim614 diyAudio Member Join Date: Jun 2008	i do understand the bias need to be different between el84 and 6v6 but wasnt sure if there's anything else i need to know.

12th October 2009, 12:07 PM	#6
Geek diyAudio Member Join Date: Sep 2004	Checkout "Anode Follower" or "Plate Follower", because that's what this type of amp is. Cheers!

12th October 2009, 05:03 PM	#7
pointy diyAudio Member Join Date: Mar 2009	i would go for 250v for both the plate anode and the screen grid a very little bit under that. it looks good on thd and you still get good watts also you can use the same opt i think ?

12th October 2009, 05:26 PM	#8
pointy diyAudio Member Join Date: Mar 2009	you maybe able to push that up by 20v to 270v if i reme..................................

12th October 2009, 08:21 PM	#9
tim614 diyAudio Member Join Date: Jun 2008	Im planing to build 2 monos cause i have a pair of 275ct PTX @75ma and EDCOR 5K8OHMS OPTX so ithought RH6v6 should be fun to build.

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