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Old 15th April 2013, 12:34 AM   #1
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Default RH6550

Hey All,

I've built two RH84's and really like the sound. I ran across a thread on DIY Tube about an RH6550. It doesn't seem to be on the RH website though. I've attached a schematic. Has anyone heard anything about this amp? Or built one? Does it sound as good as the RH84? The thread states its about a ten watt amp does that sound right?

Kevin
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Old 15th April 2013, 01:05 AM   #2
rmyauck is offline rmyauck  Canada
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Alex posted that @ AK last year and there has been a thread on it with some posts recently. Some have there own designs there and a few probably don't want SS so activity on it is a bit quiet. I guess change is hard for some!
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Old 15th April 2013, 08:13 AM   #3
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Yesterday I completed an "RH-KT120". Worked fine in my test setup. When I moved it to my main system..I had created a short somewhere and a fuse blew. But this week I'll let you know from my point of view if it is worth it going to a bigger tube with this design. Initial thoughts though: Different rather than better.
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Last edited by Bas Horneman; 15th April 2013 at 08:18 AM.
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Old 15th April 2013, 02:43 PM   #4
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That is a pretty build Nice output transformers etc any more info ?
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Old 15th April 2013, 02:55 PM   #5
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Quote:
That is a pretty build Nice output transformers etc any more info ?
I think you are referring to the chokes The chokes are by Sound Carrier and are type C3. Multi-sectioned.

The output transformers are tucked under the chassis. Psu transformers and chokes received a hum band from me. Not sure if it is effective. (Amp is quiet but perhaps it would have been as quiet without them)

Power transformers are paralled and hybrid graetz bridge for 700vac. Choke input psu. (Power supply is mono)

Outputs are probably "underpowered" 78usd a pair including shipping supplied by Twin Audio (In Manufacturers sub forum).
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Old 15th April 2013, 06:17 PM   #6
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Thought the "chokes" were chokes, thought the "PSU's" were output transformers...need a peak underneath ........
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Old 15th April 2013, 06:23 PM   #7
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need a peak underneath ........
Your wish is my command.
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Old 15th April 2013, 06:48 PM   #8
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Ta for that
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Old 27th October 2013, 02:57 PM   #9
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Bas Horneman View Post
Yesterday I completed an "RH-KT120". Worked fine in my test setup. When I moved it to my main system..I had created a short somewhere and a fuse blew. But this week I'll let you know from my point of view if it is worth it going to a bigger tube with this design. Initial thoughts though: Different rather than better.
Did you get this working? and sort out the problem.

I noticed this,

RH Amplifiers: RH Universal v.2 – Totally Universal

Regards
M. Gregg
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