audio note M-1 phono

Robertod · « **on:** 24 Feb 2019, 07:46 pm »

I'm looking for information the tube compliment.
Thanks

Robertod · « **Reply #1 on:** 24 Feb 2019, 08:39 pm »

Sorry needed to be more precise,
In the phono stage there are 4 tubes,
volume/balance 2 tubes and
power 1 tube.
this is an older model I'd say around 25 or more years old.
thanks

FullRangeMan · « **Reply #2 on:** 24 Feb 2019, 10:48 pm »

Quote from: Robertod on 24 Feb 2019, 08:39 pm

Sorry needed to be more precise,
In the phono stage there are 4 tubes,
volume/balance 2 tubes and
power 1 tube.
this is an older model I'd say around 25 or more years old.
thanks

You need replace the tubes with the exact tube model NOS or new production. In the 1950s years there was more than 5,000 different tube models on the market.
What tubes models this equip use?

galyons · « **Reply #3 on:** 24 Feb 2019, 11:35 pm »

Quote from: FullRangeMan on 24 Feb 2019, 10:48 pm

You need replace the tubes with the exact tube model NOS or new production. In the 1950s years there was more than 5,000 different tube models on the market.
What tubes models this equip use?

Robertod,

Please ignore the above nonsense!

Per the AN manual:

Congratulations on your purchase of the Audio Note (UK) M1 Line Pre Amplifier.

It is a pure Class A, Zero Negative Feedback design, employing a single ECC82 dual triode valve.

It has been specifically engineered for sonic performance rather than technical specification, and offers an outstanding level of performance and value.

It fulfills all Audio Note (UK) Level 1 criteria: -

Pure Class A operation
Zero negative feedback
Materials and component quality

The M1 Phono Pre Amplifier also incorporates a high quality Moving Magnet phonostage which uses selected examples of the ECC83 and 6DJ8 valves.

TUBE COMPLIMENT
1 x ECC82 This is the line stage. So any of the following tubes 12AU7 / ECC82 / CV4003 / 5814A
1 x 6DJ8 This is phono, so low noise tubes. So any of the following tubes 6DJ8, 6922 , 7308 (6922 or 7308 are premium tubes)
1 x ECC83 This is phono, so low noise tubes 12AX7 / ECC83 / 7025 / CV4004 (7025 is a premium tube)

There are many variations of these tubes, especially in European designations. You have some flexibility in the phono stage, such as a 5751 rather than ECC83/12AX7, depending on the output of your phono cartridge. There are also some Russian analogues to these tubes you may want to research.

You said there were 4 tubes, so maybe an earlier or later model than the manual that I have. (No date on manual.) All of these tubes are 9 pin dual triodes.

Hope this helps.

Cheers,
Geary

Robertod · « **Reply #4 on:** 25 Feb 2019, 12:10 am »

Thanks for the info. The Audio Note sounds very nice. There are a total of 7 tubes;

2 tubes for the vol/bal line.

4 tubes for the phono stage &

1 tube for the power.

some of the lettering is gone from the tubes, but what I could make out is
12au* for bal/line for the phono 12axu** and the power is *814A.
the * stands for I can't read...
I appreciate all your help. I would say this Audio Note is 25 years old or older.
thanks,

FullRangeMan · « **Reply #5 on:** 25 Feb 2019, 12:11 am »

Quote from: galyons on 24 Feb 2019, 11:35 pm

Robertod,

Please ignore the above nonsense!

Per the AN manual:

Congratulations on your purchase of the Audio Note (UK) M1 Line Pre Amplifier.

It is a pure Class A, Zero Negative Feedback design, employing a single ECC82 dual triode valve.

It has been specifically engineered for sonic performance rather than technical specification, and offers an outstanding level of performance and value.

It fulfills all Audio Note (UK) Level 1 criteria: -

Pure Class A operation
Zero negative feedback
Materials and component quality

The M1 Phono Pre Amplifier also incorporates a high quality Moving Magnet phonostage which uses selected examples of the ECC83 and 6DJ8 valves.

TUBE COMPLIMENT
1 x ECC82 This is the line stage. So any of the following tubes 12AU7 / ECC82 / CV4003 / 5814A
1 x 6DJ8 This is phono, so low noise tubes. So any of the following tubes 6DJ8, 6922 , 7308 (6922 or 7308 are premium tubes)
1 x ECC83 This is phono, so low noise tubes 12AX7 / ECC83 / 7025 / CV4004 (7025 is a premium tube)

There are many variations of these tubes, especially in European designations. You have some flexibility in the phono stage, such as a 5751 rather than ECC83/12AX7, depending on the output of your phono cartridge. There are also some Russian analogues to these tubes you may want to research.

You said there were 4 tubes, so maybe an earlier or later model than the manual that I have. (No date on manual.) All of these tubes are 9 pin dual triodes.

Hope this helps.

Cheers,
Geary

TROLL AGAIN

Robertod · « **Reply #6 on:** 25 Feb 2019, 12:38 am »

need specs on 20 year old AN M-1 phono

Phil A · « **Reply #7 on:** 25 Feb 2019, 12:59 am »

Quote from: Robertod on 25 Feb 2019, 12:38 am

need specs on 20 year old AN M-1 phono

https://www.hifiengine.com (just need to sign up for a free account) has most of the AN manuals

Robertod · « **Reply #8 on:** 25 Feb 2019, 03:19 am »

Thanks!!

galyons · « **Reply #9 on:** 25 Feb 2019, 03:53 am »

Quote from: Robertod on 25 Feb 2019, 12:10 am

Thanks for the info. The Audio Note sounds very nice. There are a total of 7 tubes;

2 tubes for the vol/bal line.

4 tubes for the phono stage &

1 tube for the power.

Volume and balance are typically potentiometers, not tubes. Audio Note typically built a component with a board for each stage/function. So there should be three boards in the unit. 1 board for B+ and filament power supplies. 1 board for the line stage and 1 board for the phono stage. It would be most helpful to see some pictures inside the preamplifier. They are probably dates on each circuit board.

Quote from: Robertod on 25 Feb 2019, 12:10 am

some of the lettering is gone from the tubes, but what I could make out is
12au* for bal/line for the phono 12axu** and the power is *814A.
the * stands for I can't read...
I appreciate all your help. I would say this Audio Note is 25 years old or older.
thanks,

12AU* would be a 12AU7. My guess on "12AXU**" would be 12AX7WC, The *814A is probably a 5814A, a variety in the 12AU7 family.

galyons · « **Reply #10 on:** 25 Feb 2019, 04:10 am »

I found a 1995 schematic for M1 linestage and M2 Phono stage. The schematics show 1 ECC82/12AU7 in the power supply, 2 ECC82/12AU7 in the line stage and the M2 phono board has 4 ECC83/12AX7 in the Phono stage. Seven, (7) tubes.

Photos would help confirm.

Cheers,
Geary

Robertod · « **Reply #11 on:** 25 Feb 2019, 04:37 am »

Thanks gallons. Attached photo

Robertod · « **Reply #12 on:** 25 Feb 2019, 04:43 am »

Thank you very much.. if you can verify from pic with your schematics, then I can upgrade tubes. Great!!

galyons · « **Reply #13 on:** 25 Feb 2019, 04:57 am »

I think we are really close! A close up shoot of each board, and the capacitance value on each of the large caps would make an ID much more positive!

Cheers,
Geary

Robertod · « **Reply #14 on:** 25 Feb 2019, 05:21 am »

Robertod · « **Reply #15 on:** 25 Feb 2019, 05:23 am »

Robertod · « **Reply #16 on:** 25 Feb 2019, 05:24 am »

Resending...sent wrong pic

Robertod · « **Reply #17 on:** 25 Feb 2019, 05:37 am »

Pics 1of 3

Robertod · « **Reply #18 on:** 25 Feb 2019, 05:40 am »

Robertod · « **Reply #19 on:** 25 Feb 2019, 05:41 am »