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Old 19th November 2011, 05:46 AM   #1101
rhone is offline rhone  Australia
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Default A new "Baby" (Huey) arrives

At last its completed - this has been about two years in the making, I got distracted by other projects.
Click the image to open in full size.Click the image to open in full size.

This has been my first "from scratch" power amp build. While not a "cost is no object" build I did want to spend a bit more that absolute minimum so it has James transformers, two chokes and all polyprop caps in the B+supply, tube rectification via 6CK3 damper diodes. Chassis is also from James. I plan on replacing the front panel with something a bit more individual.
My other amp is Allen Wright's PP2C input stage (differential, cascode 6H30) driving fixed bias EL34/KT88. Pre-amp is the line-stage bit of Mr Wright's FVP5A. Adding the phono part is the next "distraction". But I also have an itch to try some Directly Heated power tubes and I reckon some 6B4G's may soon replace the EL34's in the other amp.
Many, many thanks to Ian for the design and the help. I've learned a lot.
Rod
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Old 19th November 2011, 08:03 AM   #1102
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Job well don Rod. How does it compare against the illustrious PP2C?

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A new "Baby" (Huey) arrives
Better late than never.
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Old 19th November 2011, 10:31 PM   #1103
rhone is offline rhone  Australia
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Originally Posted by Bas Horneman View Post
Job well don Rod. How does it compare against the illustrious PP2C?
It's early days, Bas, but my initial impression is that the Huey has a more restrained sound with great fine detail but no hard edges at all. But not remotely dull and warm, either. The PP2c I think has greater large-scale dynamics but that may relate to the higher power of the EL34's. Both are fabulous amps for the money.
Us DIYers are privileged to have access to such high-end designs, I can't emphasise this enough!
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Old 20th November 2011, 09:44 AM   #1104
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Us DIYers are privileged to have access to such high-end designs, I can't emphasise this enough!
True. And thank you for your impressions.
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Old 29th November 2011, 06:27 PM   #1105
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Excellent job rhone!

I am just wiring up a new BH with SY's RLD bias with the same James transformers, it's taking shape but just one quick question - I won't be using a volume pot so should I just have a 100K resistor to ground from the input?

Cheers
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Old 29th November 2011, 07:55 PM   #1106
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I won't be using a volume pot so should I just have a 100K resistor to ground from the input?
That is correct.
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Old 29th November 2011, 08:06 PM   #1107
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Old 2nd December 2011, 01:07 PM   #1108
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Originally Posted by Bas Horneman View Post
That is correct.
So this is correct if I have a volume control in a preamp for example. Would it be the same if I want to use a temporary external volume control? So just a box with an input/output and a 100K pot. Would I still need the 100K resistor at the input of the main amplifier, or should I omit it?

Any issue with this set up? the cable shouldnt be more than a couple fo feet.

Cheers

Charlie
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Old 2nd December 2011, 04:00 PM   #1109
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Would I still need the 100K resistor at the input of the main amplifier, or should I omit it?
You don't need it in that case. But if you keep it in it will hardly have any detrimental effect if at all. Personally I would just keep it there instead of soldering it in and out when you are using a preamp.
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Old 2nd December 2011, 04:02 PM   #1110
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Thank you, i'll leave it in as you said.
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