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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: 28 Sep 2014, 19:00 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Is the Mentor SS or tube? I have never liked in Quad SS amp or any Luxman for that matter. One quad I did like was a PP. tube amp with 6550s and and EF86 driver. Good punchy sound.

All system colour the sound. Just pick your favourite colour.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 29 Sep 2014, 05:10 
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mwhouston wrote:
Is the Mentor SS or tube? I have never liked in Quad SS amp or any Luxman for that matter. One quad I did like was a PP. tube amp with 6550s and and EF86 driver. Good punchy sound.

All system colour the sound. Just pick your favourite colour.



The Mentor uses a 6SN7 input and an ECC99 output, although I replaced the (JJ) ECC99 with a Brimar 12BH7, which I prefer. I have tried a KEN RAD 6NS7GT / VT-231 and a Sylvania JAN-CHS-6SN7GT, 3 hole plate "Bad Boy" 1952 , I think I prefer the Sylvania.
The Mentor was actualy designed around a CV181, but because I built it while Brian was still organizing putting the kit together he gave me a Chinese 6SN7. I have ordered a CV181 Shuguang Treasure series, I'm just awaiting it's arrival. It also uses 2 X 5V3 rectifiers on the power side. I love that tube sound. I'm not getting into any valve/SS arguments - each to his own. The beauty of the Quad was it's utter nuetrality, it allowed me to tube roll the DAC4.1 (resistive ladder type) and the Mentor without adding anything of it's own to the sound. I put a link to The Mentor on a previous post, it's worth looking at, also the DAC4.1 is on the same site (ANK audio kits).
Here is an odd thing, all the 6NS7's I tried were hidiously microphonic - until I connected the Lacewood and the microphony disappeared. I was not expecting that. It's all singing along beautifuly at the moment.
Yours, Keith.


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PostPosted: 03 Oct 2014, 20:07 
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PostPosted: 03 Oct 2014, 21:04 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
Very nice looking amp. I do like padauk. I have a large plank in my shop right now just waiting for a project. Your amp has inspired me.

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PostPosted: 04 Oct 2014, 06:00 
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Suncalc wrote:
Very nice looking amp. I do like padauk. I have a large plank in my shop right now just waiting for a project. Your amp has inspired me.

Thank you. A slight word of warning, Padauk will turn brown over a period of a few months. This can be slowed using UV protective urethane, although saying that I would prefer brown over urethane - it is horrible stuff. My amp is finished with Danish oil.
Also, thank you for the design. I am falling in love with this amp, it was originaly meant for my bedoom so I could simply plug my phone in but I now want to keep it in my living room. My speakers are Focal 906's with 89dB sensitivity and my room is small. Your amp fills it with music.
Yours, Keith.


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PostPosted: 04 Oct 2014, 20:28 
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Location: Australia
Very nice build. Looks great.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 26 Feb 2015, 20:45 
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Location: US Pacific Northwest
I've been looking at some tube characteristics and decided to try a little experiment. I just dropped a pair of NOS 6F6GTs into this amp. Of course the 6F6 is the same pentode as the 42 and the 2A5; both with decent reputations. I think people sometimes forget about the humble little octal base 6F6.

It's a very nice sound. Just a little softer than the 6V6s and of course just a little less power. But with some soft jazz and blues it is a very nice pairing.

I am going to go to a GZ34 rectifier a little later (to increase the B+ and try to regain a little peak power). When I do I'll actually take some measurements and report back. But if you don't really care about the numbers, I do recommend that you give some 6F6s a try in this amp.

A nice little diversion.

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It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


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PostPosted: 27 Feb 2015, 06:20 
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Location: Australia
Suncalc wrote:
I've been looking at some tube characteristics and decided to try a little experiment. I just dropped a pair of NOS 6F6GTs into this amp. Of course the 6F6 is the same pentode as the 42 and the 2A5; both with decent reputations. I think people sometimes forget about the humble little octal base 6F6.

It's a very nice sound. Just a little softer than the 6V6s and of course just a little less power. But with some soft jazz and blues it is a very nice pairing.

I am going to go to a GZ34 rectifier a little later (to increase 5the B+ and try to regain a little peak power). When I do I'll actually take some measurements and report back. But if you don't really care about the numbers, I do recommend that you give some 6F6s a try in this amp.

A nice little diversion.

Ok, can I drop a 2A5 in my Black Lace. I think not. Wrong heater EMF. Outside of 6F6 and 6L6 what else can I drop in?

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 27 Feb 2015, 14:35 
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Joined: 11 Nov 2013, 22:35
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Matt,

I came here to ask,
If you were to build this 6v6 amp again today would you change anything, but it looks like the wheels of progress are already turning.

Would you still go with a hammond power transformer or consider an edcor?
Would you still go with the 5U4 rectifier tube?
Would you go with the split power supply or not?
Or any other changes?


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PostPosted: 27 Feb 2015, 17:57 
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Joined: 06 Jun 2008, 18:23
Posts: 4834
Location: Australia
I had to do a split PS because my Hammond 5mH chokes only handle 50mA. But not hard to realise it was a win-win decision.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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