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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 12 Oct 2009, 19:00 
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Joined: 18 May 2009, 18:42
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Location: Littleton, Colorado
Hey good call with the grounds - I just connected the ground to the power supply case and the hum went away. Thanks!


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PostPosted: 15 Oct 2009, 21:11 
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Joined: 14 Oct 2008, 17:35
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Location: Dartmouth, Nova Scotia
I am glad that worked, I guess that just points out the reason for there being a grounding post beside the Phono inputs onstereos, don't really understand why it is such a problem.

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PostPosted: 16 Oct 2009, 12:59 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
The phono grounding lug on older turntables was typically connected to the metal parts of the tonearm. On newer tables grounding of the tonearm is usually accomplished through the leads so most newer table do not have a separate grounding lug.
Cheers

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PostPosted: 22 Oct 2009, 05:49 
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Joined: 22 Oct 2009, 00:53
Posts: 4
Location: Sacramento
Hey All.
I have been doing some SS repair on vintage Pioneer recievers but in my search for a great Bass Preamp I have ended up with 2 point to point tube style preamps that I really like the sound of but would like to build my own to get exactly what Im looking for.
I want it to fit in a rack mountable 1 u case so I am looking at starting the project with the Hammond 546-229B230 which is a 230 volt low profile transformer and a 546-229B16 low profile 16 volt.
I have drawn up a schematic for the more complicated one that uses a 12ax7 and a 12ux7 tube and a 3 band EQ with input gain and output volume.
I would like to start simple so that I can learn how it works and I would really like to custom taylor the 3 band EQ.
The schematic that I drew up is very ametuer as I couldnt remeber some of the proper symbols but it does seem to make sense for the most part,I could scan it and post it if that would help.
Thanks Steve


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PostPosted: 22 Oct 2009, 21:03 
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Joined: 14 Oct 2008, 17:35
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If you want to Mr. Fuzzbox, you could email it to me and I may be able to even find the time to redraw it for you in a more "professional" way.

Are you by any chance using a similar preamp design as mine or is this a totally different design? With the right tuning this preamp would work very well as a bass guitar preamp and a guitar preamp, as well as audio. I have been thinking allot about how to make this preamp capable of all common needs suggested but at the same time make one better than the one I have now and the C8 or C7 preamp designs would get the best benefit if I can find a good cheap way of modifying the circuit to make it easy and cheap to construct and maybe keep about the same size.

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PostPosted: 22 Oct 2009, 21:55 
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The design appears to be very similar to yours for both of the Preamps that I have.The more complicated one that uses two tubes sounds really good but there are still some things to work out in my opinion for example you can turn up the input gain to achive a pretty thick distortion/Saturation sound and it was designed to do this but I am finding that it seems to be a little to sensative and is a fine balance between the input gain and the output volume if you are wanting a clean tone and still provide my Solid State amp with enough input to achive the volume level that I need.
Steve


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PostPosted: 23 Oct 2009, 17:52 
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Hi Steve welcome to the forum. Yes, please post the schematic so we can follow along. If the scan is larger than 250kB you can email it to the address shown in the site banner and I will post it for your.
Cheers, Gio

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PostPosted: 23 Oct 2009, 20:24 
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Joined: 22 Oct 2009, 00:53
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Location: Sacramento
Like I said it is really rough and needs some work before we work with it.
I am excited to get in to this project.
Thanks Steve


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    PostPosted: 24 Oct 2009, 11:00 
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    Joined: 14 Oct 2008, 17:35
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    Location: Dartmouth, Nova Scotia
    Fuzzboxvoodoo wrote:
    Like I said it is really rough and needs some work before we work with it.


    Aaaah, yes indeed. :mrgreen:

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    PostPosted: 24 Oct 2009, 11:18 
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    Joined: 22 Oct 2009, 00:53
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    Location: Sacramento
    I warned you.I never intended to post it it was just a rough draft from a Mechanic not a electrical guy.
    Steve


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