What tube is that? 😭

[Humpty]

Wotcher peoples, about 14 years ago I bought a Simmons Audio Research tube amplifier.

[Humpty]

Wotcher peoples, about 14 years ago I bought a Simmons Audio Research tube amplifier. 35W per channel AB amp.

 

The tubes I just cannot identify are marked M01A. I've been able to replace the quad WY3P. 

 

Much hunting lead to 2 posts on sale sites suggesting 6sl7 and 6sn7 which have been unsuccessful.

 

A recent example went for auction on ebay for $456 but the seller knew less than me. 

 

Does anyone recognise the amp or tubes, have a link or a suggestion.

It does sound lovely and still works but I'd hate to think it ends when the tubes die.

 

[muon*]

Does it look like this amp?

 

 

Not to be confused with "Audio Research".

 

TRADEMARK DETAILS

Owner:

Veng Kin Simon Lao

Type:

Word

Description:

Simmons Audio Research

(Trade mark is stated as lapsed)

http://www.ipaustralia.com.au/applicant/lao-veng-kin-simon/trademarks/1319259/

 

What tubes are you asking about?

 

Edit: I think the power tube is a Chinese reproduction or the 01A, see a few Chinese amps using them.

Interestingly this amp on China Direct looks very similar to the Simmons one in the pic I posted above.

http://www.china-direct-buy.com/v/4/product_detail/3795815/VACUUM_TUBE_AMPLIFIER_M2OA.html

Edited August 14, 2021 by muon*

[muon*]

Hope you didn't try 6SN7/6SL7 in those positions, those are twin triode pre amp tubes, the golf ball shaped power tubes in your amp I think are Chinese reproductions of the 01A a single higher power triode.

 

Edit: you could email China Direct in that link I posted in your other thread and see if they can sell you the M01A tubes.

Edited August 14, 2021 by muon*

[Humpty]

1 hour ago, muon* said:

Does it look like this amp?

 

 

Not to be confused with "Audio Research".

 

TRADEMARK DETAILS

Owner:

Veng Kin Simon Lao

Type:

Word

Description:

Simmons Audio Research

(Trade mark is stated as lapsed)

http://www.ipaustralia.com.au/applicant/lao-veng-kin-simon/trademarks/1319259/

 

What tubes are you asking about?

 

Edit: I think the power tube is a Chinese reproduction or the 01A, see a few Chinese amps using them.

Interestingly this amp on China Direct looks very similar to the Simmons one in the pic I posted above.

http://www.china-direct-buy.com/v/4/product_detail/3795815/VACUUM_TUBE_AMPLIFIER_M2OA.html

 

1 hour ago, muon* said:

Hope you didn't try 6SN7/6SL7 in those positions, those are twin triode pre amp tubes, the golf ball shaped power tubes in your amp I think are Chinese reproductions of the 01A a single power triode.

 

Edit: you could email China Direct in that link I posted in your other thread and see if they can sell you the M01A tubes.

Thanks for getting back so quickly 

 

That is the exact amp I have and I'll get in touch with the seller to see if they will sell the tubes.

I've been worried about the 01A tubes as they are only 4 pins but in doing the pics I see that even though the M01A is an octal, but taking the tubes out and checking the base only 4 have been filled, (are in use?), I've seen the Chinese amps and yep they look to be them but I got no reply from a different seller.

 

I was going off this

M01A Vacuum Tube. for Sale - Knoppix.net

as one reference and yep I tried and thank God no damage done.

[Humpty]

2 hours ago, muon* said:

Does it look like this amp?

 

 

Not to be confused with "Audio Research".

 

TRADEMARK DETAILS

Owner:

Veng Kin Simon Lao

Type:

Word

Description:

Simmons Audio Research

(Trade mark is stated as lapsed)

http://www.ipaustralia.com.au/applicant/lao-veng-kin-simon/trademarks/1319259/

 

What tubes are you asking about?

 

Edit: I think the power tube is a Chinese reproduction or the 01A, see a few Chinese amps using them.

Interestingly this amp on China Direct looks very similar to the Simmons one in the pic I posted above.

http://www.china-direct-buy.com/v/4/product_detail/3795815/VACUUM_TUBE_AMPLIFIER_M2OA.html

Bugger just tried the link and it failed, I'll look at the 01A's on ebay.

[muon*]

I'd look for the same as original, the M01A.

[Humpty]

Just now, muon* said:

I'd look for the same as original, the M01A.

thanks I'll keep trying.

[muon*]

Good luck, maybe message or email every seller selling amps using it you find.

 

I have googled and had no luck

 

If worse comes to worse, you could have a tech' look at the spec's and try and redesign it for another tube type.

Hope you don't need to resort to that though.

[Humpty]

Just now, muon* said:

Good luck, maybe message or email every seller selling amps using it you find.

 

I have googled and had no luck

 

If worse comes to worse, you could have a tech' look at the spec's and try and redesign it for another tube type.

Hope you don't need to resort to that though.

Yeah I know a guy (big maybe), but the reality of a 700km round trip to Melbourne, on top of Covid means my options are limited.

[FNQ Outcast]

Perhaps message @xlr8or, I suspect he will be able to provide advice...

[Humpty]

9 minutes ago, FNQ Outcast said:

Perhaps message @xlr8or, I suspect he will be able to provide advice...

many thanks I'll send him a message

[Martykt]

4 hours ago, muon* said:

Edit: I think the power tube is a Chinese reproduction or the 01A, see a few Chinese amps using them.

Interestingly this amp on China Direct looks very similar to the Simmons one in the pic I posted above.

http://www.china-direct-buy.com/v/4/product_detail/3795815/VACUUM_TUBE_AMPLIFIER_M2OA.html

Looks very much like an 01A tube sitting next to the amp.

 

[Humpty]

It does doesn't it. I think I've gotten myself confused by the 8 pins on the M01A

[Martykt]

3 hours ago, muon* said:

I think are Chinese reproductions of the 01A a single higher power triode.

https://www.radiomuseum.org/tubes/tube_m01a.html

 

https://www.radiomuseum.org/tubes/tube_01a.html
 

Could well be a copy of sorts.

The only issue is the original 01A and M01A tubes are 4 pin tubes and looking at the Simmons M01A it appears they've used a different base using only 4 of the pins.

 

It may be possible to use the original M01A/01A tubes which could well be worth doing however the tube sockets would have to be changed.

[Martykt]

3 minutes ago, Humpty said:

It does doesn't it. I think I've gotten myself confused by the 8 pins on the M01A

Just finished typing a reply on this !!  

It appears that they have used different bases most likely due to not being able to get a similar base and only soldered 4 of the 8 pins with the rest being dummy pins.

[muon*]

Yeah, would need to change the sockets to use an original 01A.

 

Edit: I really would want to see the data sheet of the thing they used so I could compare it to an original, even if I planed on changing sockets.

 

4 pin bases are not hard to get, they are used in any power Triode (211 ect'), sockets are easy too, it appears they are faking a 01A by modifying the connections of a different tube that is 8 pin, is my guess.

 

My guess is this tube they have used has different electrical parameters to a real 01A or M01A tube.

 

Unless you can get the original tubes you might have to get a tech' to redesign for a different tube, one that matches the output transformers in the amp, and plate voltages ect' provided by the amp's power transformer.

 

Without a data sheet of that tube they have used, It's all guessing.

 

I'd look for the specific tubes it came with.

 

Edited August 14, 2021 by muon*

[xlr8or]

Reach out to this seller and ask them to source replacement M01A tubes for you.

 

https://m.aliexpress.com/item/345157763.html

 

Edit: Try here as well.

 

https://www.banleongbros.com/home_products/musicinfinity.htm

 

https://www.ankux.com/catalog/music-infinity-vacuum-tube-amplifier-101041411532206154.html

Edited August 14, 2021 by xlr8or

[Humpty]

20 hours ago, xlr8or said:

Reach out to this seller and ask them to source replacement M01A tubes for you.

 

https://m.aliexpress.com/item/345157763.html

 

Edit: Try here as well.

 

https://www.banleongbros.com/home_products/musicinfinity.htm

 

https://www.ankux.com/catalog/music-infinity-vacuum-tube-amplifier-101041411532206154.html

 

22 hours ago, muon* said:

Yeah, would need to change the sockets to use an original 01A.

 

Edit: I really would want to see the data sheet of the thing they used so I could compare it to an original, even if I planed on changing sockets.

 

4 pin bases are not hard to get, they are used in any power Triode (211 ect'), sockets are easy too, it appears they are faking a 01A by modifying the connections of a different tube that is 8 pin, is my guess.

 

My guess is this tube they have used has different electrical parameters to a real 01A or M01A tube.

 

Unless you can get the original tubes you might have to get a tech' to redesign for a different tube, one that matches the output transformers in the amp, and plate voltages ect' provided by the amp's power transformer.

 

Without a data sheet of that tube they have used, It's all guessing.

 

I'd look for the specific tubes it came with.

 

 

22 hours ago, Martykt said:

Just finished typing a reply on this !!  

It appears that they have used different bases most likely due to not being able to get a similar base and only soldered 4 of the 8 pins with the rest being dummy pins.

 

On 14/08/2021 at 5:01 PM, FNQ Outcast said:

Perhaps message @xlr8or, I suspect he will be able to provide advice...

Thank you all for your help, I've sent out some emails and hope to hear back soon, I'll update when there's an end point 

[Martykt]

2 hours ago, Humpty said:

 

 

 

Thank you all for your help, I've sent out some emails and hope to hear back soon, I'll update when there's an end point 

If you end up needing help converting to 4 pin sockets let me know.

 

Also in your correspondence try and get the specs for the Simmons M01A tube as it will help in figuring out whether any other modifications may need to be done to change over to the original tubes if you decide to go that way.