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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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 Post subject: Re: Baxandall circuit
PostPosted: 12 Aug 2018, 12:17 
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Joined: 13 May 2016, 02:02
Posts: 95
Location: Javea, Spain
I first found DIY Audio Projects about two and a half years ago. I've built the 6EM7 Vertical Amp twice in different cabinets, the 4S Universal Pre-Amp twice in different cabinets, the Lacewood 6V6 V.2 twice in different cabinets and a Baxandall Tone Stack in a wine box. All the builds have been fun and I've had them all in different combinations to find the sound I like best. Friends have bought some of the builds from me and I'm now left with a 6EM7 Amp, a 6V6 V.2 Amp and a Baxandall Tone Stack, all three of them in different cabinets. After many hours listening and a lot of soul searching, I decided that the 6V6 with the Baxandall Tone Stack was the perfect combination. I can't overstate the importance of the tone stack. I know many people say that with bass and treble controls you're colouring the sound, that you're interfering with the pure signal. Well so be it, to my ears (which are a getting on a bit and not as good as they could be), being able to adjust the higher and lower frequencies to suit the listening environment and my substandard ears works perfectly.

So what to do about the look of the equipment. I decided to completely disassemble the 6V6 and the tone stack and rebuild them in matching cabinets. Also space is a problem so I decided to stack them.
Finished the project this morning with the exception of some nice feet for the 6V6.

The sound is perfect. Not a whisper of noise or hum from a relatively cheap pair of speakers. Can't wait to get it connected to my Fostex Back Loaded Horns upstairs. I'm going to post this on the Lacewood 6V6 V.2 thread as well. It really is about the two together.


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 Post subject: Re: Baxandall circuit
PostPosted: 16 Aug 2018, 15:37 
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Joined: 25 Jan 2015, 11:51
Posts: 54
Location: Netherlands
Looks great !


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 Post subject: Re: Baxandall circuit
PostPosted: 04 Sep 2018, 02:00 
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Joined: 13 May 2016, 02:02
Posts: 95
Location: Javea, Spain
Quick question.... I've used Log, but which is correct. Lin or Log for bass and treble controls?


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 Post subject: Re: Baxandall circuit
PostPosted: 04 Sep 2018, 02:10 
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Joined: 06 Jun 2008, 18:23
Posts: 4944
Location: Australia
I believe linear for tone controls.

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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 Post subject: Re: Baxandall circuit
PostPosted: 04 Sep 2018, 02:14 
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Joined: 13 May 2016, 02:02
Posts: 95
Location: Javea, Spain
Thanks for quick reply. Need to order some soon.


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 Post subject: Re: Baxandall circuit
PostPosted: 04 Sep 2018, 13:32 
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Joined: 06 Apr 2009, 10:08
Posts: 1460
Location: US Pacific Northwest
john55 wrote:
Quick question.... I've used Log, but which is correct. Lin or Log for bass and treble controls?
It depends on the style of tone stack. A Baxandall tone stack requires 'Log B' taper pots (i.e. 10% total resistance at 50% shaft setting) for both the Bass and Treble controls.

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 Post subject: Re: Baxandall circuit
PostPosted: 05 Sep 2018, 02:22 
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Joined: 13 May 2016, 02:02
Posts: 95
Location: Javea, Spain
Thanks Matt, I didn't know there were two types of Log pots. Log A (30% total resistance at 50% shaft setting) and Log B (10% total resistance at 50% shaft setting). The Alpha pots I'm using aren't marked but, as far as I can see, (searching on Internet) Log A is pretty rare, so will assume the ones I have are Log B.


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 Post subject: Re: Baxandall circuit
PostPosted: 05 Sep 2018, 22:46 
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Joined: 20 Feb 2014, 10:35
Posts: 51
Location: NZ
Log A potentiometers are very common, these are the type normally used for volume controls.


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 Post subject: Re: Baxandall circuit
PostPosted: 06 Sep 2018, 01:27 
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Joined: 02 Mar 2009, 12:41
Posts: 1057
Location: Vänersborg, Sweden
There are sometimes some confusion with potentiometr markings. Even thouh there is some kind of standard there can be variations. However AUDIO means log.
I always check a potentiometer from my stores according to john55's note.

If running out of logaritmic potentiometers, heres a way to make one oneself: http://sound.whsites.net/project01.htm

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