good circuit to use with Grounded Grid Pre

g(f(e)) · 13th January 2011, 04:00 PM

Hello,

I have already built a grounded grid pre and it works fine. I am ready to start another project and I have been tossing various tube types and designs around and still have not come up with something to try. I have been thinking that I could save time and money if I just build the output circuit and use my existing pre amp.

I am wondering if anyone has had any good matches with the Grounded Grid and if so - what tubes did you use, circuit, etc.

Thank you.

Gary

Bigun · 13th January 2011, 05:39 PM

Can we see the design for the grounded grid pre ?

g(f(e)) · 13th January 2011, 06:25 PM

It is the Bruce Rozenblit design from Audio Reality.

DF96 · 13th January 2011, 09:51 PM

I have just had a look at it on Google books (around page 86). It is not a grounded grid preamp, but a cathode-coupled amp (otherwise known as long-tail pair) with an SRPP-like output and negative feedback to the supposedly grounded grid. Nothing especially wrong with this circuit, just not what it is called. True grounded grid preamps were used at UHF and microwave frequencies, but audio does not have to work up to 1GHz!

It will probably have quite a high output impedance (1-2K?) but OK provided the cable is not too long, and the main amp input impedance is either high or linear. This means that it could be a bit fussy about partners (but not through "discrimination"!).

Bas Horneman · 14th January 2011, 09:03 AM

Quote:

I am wondering if anyone has had any good matches with the Grounded Grid and if so - what tubes did you use, circuit, etc.

Bruce's grounded grid has a solid reputation. And I think it should work with a wide range of amplifiers.

Rather than ask what goes well with it. I think it would be better to ask yourself. What speakers do I have (or want to have soon)? How big is my room? What type of music do I prefer? How much do I want to spend? Should I get a kit or diy everything...etc. etc.

If you answer some of these questions I think it would be easier to suggest a suitable amp.

13th January 2011, 04:00 PM	#1
g(f(e)) diyAudio Member Join Date: Dec 2007	good circuit to use with Grounded Grid Pre Hello, I have already built a grounded grid pre and it works fine. I am ready to start another project and I have been tossing various tube types and designs around and still have not come up with something to try. I have been thinking that I could save time and money if I just build the output circuit and use my existing pre amp. I am wondering if anyone has had any good matches with the Grounded Grid and if so - what tubes did you use, circuit, etc. Thank you. Gary

13th January 2011, 05:39 PM	#2
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	Can we see the design for the grounded grid pre ? __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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13th January 2011, 06:25 PM	#3
g(f(e)) diyAudio Member Join Date: Dec 2007	It is the Bruce Rozenblit design from Audio Reality.

13th January 2011, 09:51 PM	#4
DF96 diyAudio Member Join Date: May 2007	I have just had a look at it on Google books (around page 86). It is not a grounded grid preamp, but a cathode-coupled amp (otherwise known as long-tail pair) with an SRPP-like output and negative feedback to the supposedly grounded grid. Nothing especially wrong with this circuit, just not what it is called. True grounded grid preamps were used at UHF and microwave frequencies, but audio does not have to work up to 1GHz! It will probably have quite a high output impedance (1-2K?) but OK provided the cable is not too long, and the main amp input impedance is either high or linear. This means that it could be a bit fussy about partners (but not through "discrimination"!).

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