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Old 5th March 2014, 02:21 PM   #21
JPS is offline JPS  India
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Quote:
Originally Posted by 2bamp View Post
I tried a couple of 6201 and even a 12AX7. It seems like the driver just isn't pushing enough into the power tubes. Has anyone else run into this?
Try 12AT7 instead of 6201.
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Old 15th March 2014, 10:08 PM   #22
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2bamp-

I just tested my new RH84 with audio from my phone's headphone out first and the volume was underwhelming. Plugged into my computer, I get way more. I haven't plugged it into a proper 2V source yet, but I bet it will be pretty consistent with other 5W amps I've used. Get thee a preamp (or a 2V source)!

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Old 16th March 2014, 01:58 PM   #23
2bamp is offline 2bamp  Canada
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I have found the same thing. Using my netbook as a source gives way better results. In fact, I am pretty happy with it, and since I almost exclusively use my tablet, I am also glad to have a use for some more "osbsolete" electronics. Next one will get an additional gain stage.
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Old 30th March 2014, 07:16 PM   #24
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I have always found that it makes sense to build it as the designer originally intended and then modify after that if we can define a specific "problem". Mr. Kitic does answer emails promptly and is a big help when tackling the RH projects.

I just finished a RH307A and there is nothing that I think needs changing. An iPod is "enough" but the DAC from my "big" stereo has a lot more grunt.

According to Alex Kitic, 1V input normally drives his amps to full power. You can check your players spec to see what it needs. I would not change the feedback. Many MP3 players have limited output to prevent deafness.

The comment about it being "Schade" is not correct. They do have a similar feedback arrangement, but similar is not the same.

Changing the 12AT7 to a 12AX7 will not work. The same holds true for a 12AU7. Mr. Kitic explains why at his blog. I have no difference in gain with a 6201 or 12AT7.

My next amp is probably a RH84 to complement the RH307A Super in a triamp situation. It will drive horns.
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Old 30th March 2014, 08:11 PM   #25
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Quote:
The comment about it being "Schade" is not correct. They do have a similar feedback arrangement, but similar is not the same.
It is Schade feedback, just a rather poor example of it.

Shoog
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Old 31st March 2014, 04:13 AM   #26
rowuk is offline rowuk  Germany
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It is Schade feedback, just a rather poor example of it.

Shoog
Considering the remarkable sound quality, maybe "poor" is a less applicable description.

I do not consider all anode/anode feedback to qualify as Schade. Granted, we do stand on the shoulders of giants........regardless of what we implement in tubes.
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Old 31st March 2014, 07:14 AM   #27
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I suggest you go and read the Tubecad article to see why it is Schade feedback.

Shoog
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