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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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 Post subject: Re: 6dj8/6n1p phonostage
PostPosted: 21 Aug 2008, 10:20 
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Joined: 04 Jun 2008, 21:02
Posts: 84
Location: Philippines
I don't have a picture of the underside.

I have compared the 6922 and the 6n1p, I liked the 6n1p better.

Today, I got bored and recomputed the RIAA for ECC81/12at7 (the 6n1p have a very lowish gain). So I re-wired the phonostage using ECC81/12at7 based on this schematic:

Image

I am listening to it now, and it has better and tighter bass, the highs has more dynamic and it seems the vocals are a bit more clean/defined.

Will continue to listen to it and see if I can tweak it some more. Unfortunately, I cannot do a side by side comparison with my 6n1p phonostage (I am using the same chassis and PSU).


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 Post subject: Re: 6dj8/6n1p phonostage
PostPosted: 21 Aug 2008, 23:17 
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Joined: 31 Jul 2008, 23:21
Posts: 62
Hi Alexg,

I found these comments about those tubes on the DecWare site.

"The input tube is a single 6N1P, 6922 or 6DJ8 - your choice. 6N1P's have the warmest tone, 6922's have the best dynamics, 6DJ8's have the most air and micro-detail with a touch less bass."

I like the 6DJ8 over the 6922, but have never tried the 6N1P.

Was the previous RIAA equalization not accurate?

Thanks for sharing.


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 Post subject: Re: 6dj8/6n1p phonostage
PostPosted: 22 Aug 2008, 08:26 
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Joined: 04 Jun 2008, 21:02
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Location: Philippines
billp wrote:
I found these comments about those tubes on the DecWare site.

"The input tube is a single 6N1P, 6922 or 6DJ8 - your choice. 6N1P's have the warmest tone, 6922's have the best dynamics, 6DJ8's have the most air and micro-detail with a touch less bass."

I like the 6DJ8 over the 6922, but have never tried the 6N1P.

Was the previous RIAA equalization not accurate?

I just like the sound of 6n1p better than the 6922 and the 6DJ8, on circuits that I have tried.

The previous RIAA equalization is accurate, but since I used ECC81/12at7, the plate resistance and the plate load resistor is different, so the values for the passive RIAA capacitors and resistors needs to be recomputed.

Thanks.


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