Linn Forums

Current time: 2017-10-23, 18:05 Hello There, Guest! (LoginRegister)

Linn Forums / Linn Music Systems & Hi-fi Separates / Turntables & Record Players: Linn Sondek LP12 / 3rd Party Modifications and Parts v / Hercules, very quiet hum @ 45

Post Reply 
Hercules, very quiet hum @ 45
2017-04-07, 09:56 (This post was last modified: 2017-04-07 09:57 by allthingsanalogue.)
Post: #1
Hercules, very quiet hum @ 45
I have a Mose PSU on my deck.

At 33 the motor is dead silent but at 45 there is very slight hum form the motor. It's not mechanical noise but the type of hum you get from a transformer.

If you touch the motor while it's running at 33 it keeps going but if you touch it at 45 it stops rotating but still hums.

You have to put your ear close to deck to hear it but it's definitely there.

It does it even when the sub platter and belt are off the deck

It's aways done it since I've had it, over a year but has anyone else experienced this?

I'm thinking a Lingo would solve this. Big Grin
Find all posts by this user
Quote this message in a reply
2017-04-07, 14:35
Post: #2
RE: Hercules, very quiet hum @ 45
(2017-04-07 09:56)allthingsanalogue Wrote:  I have a Mose PSU on my deck.

At 33 the motor is dead silent but at 45 there is very slight hum form the motor. It's not mechanical noise but the type of hum you get from a transformer.

If you touch the motor while it's running at 33 it keeps going but if you touch it at 45 it stops rotating but still hums.

You have to put your ear close to deck to hear it but it's definitely there.

It does it even when the sub platter and belt are off the deck

It's aways done it since I've had it, over a year but has anyone else experienced this?

I'm thinking a Lingo would solve this. Big Grin

The question is the motor specification is 50Hz to 60Hz.

At 45 rpm, it is 67.5 Hz.
Visit this user's website Find all posts by this user
Quote this message in a reply
2017-04-07, 15:44
Post: #3
RE: Hercules, very quiet hum @ 45
It's a UK deck so presumably 50Hz?
Find all posts by this user
Quote this message in a reply
2017-04-07, 15:51
Post: #4
RE: Hercules, very quiet hum @ 45
(2017-04-07 15:44)allthingsanalogue Wrote:  It's a UK deck so presumably 50Hz?

50Hz is only for 33.3rpm, and therefore motor works within the specification.

But the same 21mm pulley wants to make platter spins at 45 rpm, it needs a 67.5 Hz, that is outside the motor specification of 50-60Hz.

All Premotec AC synchronous motor specification are 100 V AC 50-60Hz
60Hz is for USA 17mm smaller pulley. Smile
Visit this user's website Find all posts by this user
Quote this message in a reply
2017-04-07, 16:04 (This post was last modified: 2017-04-07 18:22 by allthingsanalogue.)
Post: #5
RE: Hercules, very quiet hum @ 45
(2017-04-07 15:51)mooto Wrote:  
(2017-04-07 15:44)allthingsanalogue Wrote:  It's a UK deck so presumably 50Hz?

50Hz is only for 33.3rpm, and therefore motor works within the specification.

But the same 21mm pulley wants to make platter spins at 45 rpm, it needs a 67.5 Hz, that is outside the motor specification of 50-60Hz.

All Premotec AC synchronous motor specification are 100 V AC 50-60Hz
60Hz is for USA 17mm smaller pulley. Smile

Thanks.

So it would probably do it with a Lingo also to some but smaller degree due to better sinewave regulation?

I can't hear it anyway through the speakers no matter how high i turn up the volume.
Find all posts by this user
Quote this message in a reply
2017-04-08, 00:13 (This post was last modified: 2017-04-08 01:00 by Edmund.)
Post: #6
RE: Hercules, very quiet hum @ 45
(2017-04-07 16:04)allthingsanalogue Wrote:  
(2017-04-07 15:51)mooto Wrote:  
(2017-04-07 15:44)allthingsanalogue Wrote:  It's a UK deck so presumably 50Hz?

50Hz is only for 33.3rpm, and therefore motor works within the specification.

But the same 21mm pulley wants to make platter spins at 45 rpm, it needs a 67.5 Hz, that is outside the motor specification of 50-60Hz.

All Premotec AC synchronous motor specification are 100 V AC 50-60Hz
60Hz is for USA 17mm smaller pulley. Smile

Thanks.

So it would probably do it with a Lingo also to some but smaller degree due to better sinewave regulation?

I can't hear it anyway through the speakers no matter how high i turn up the volume.

You are welcome!

Vintage Lingo doesn't mean the sine wave is better regulation.

It depends on the healthiness and quality of capacitors.

Hercules using 3 high quality Vishay capacitors made in Netherland.

Some Lingo is over 25 years old, if one capacitor dried up and has only 20-30 % function, it will never get a good sinewave output to drive the motor smoothly at 33.3 rpm.
Visit this user's website Find all posts by this user
Quote this message in a reply
2017-04-08, 12:19
Post: #7
RE: Hercules, very quiet hum @ 45
The hum is not because the motor is being driven outside the 60hz range. A Lingo will drive it with the same frequency for 45rpm and the motors don't hum with a Lingo. All Lingo supplies require the 21mm motor pulley.

Gary

LP12/Cirkus/Radikal/Kore/Ekos1/Tkable balanced/Uphorik/Krystal/ADSM/1/aktiv Akubariks
Visit this user's website Find all posts by this user
Quote this message in a reply
2017-04-08, 13:28 (This post was last modified: 2017-04-08 13:35 by allthingsanalogue.)
Post: #8
RE: Hercules, very quiet hum @ 45
(2017-04-08 12:19)bettermusic Wrote:  The hum is not because the motor is being driven outside the 60hz range. A Lingo will drive it with the same frequency for 45rpm and the motors don't hum with a Lingo. All Lingo supplies require the 21mm motor pulley.

Faulty Hercules then? As it's dead silent at 33. If you touch the pulley on 45 without a belt on it just stops but continues to vibrate.

Or just not as good as a lingo....
Find all posts by this user
Quote this message in a reply
2017-04-08, 13:40
Post: #9
RE: Hercules, very quiet hum @ 45
(2017-04-08 13:28)allthingsanalogue Wrote:  
(2017-04-08 12:19)bettermusic Wrote:  The hum is not because the motor is being driven outside the 60hz range. A Lingo will drive it with the same frequency for 45rpm and the motors don't hum with a Lingo. All Lingo supplies require the 21mm motor pulley.

Faulty Hercules then? As it's dead silent at 33. If you touch the pulley on 45 without a belt on it just stops but continues to vibrate.

The Lingo and Axis are the same way, (except there is no hum) at 45rpm they require the platter to be on or it just stops when the circuit goes to low voltage or if you touch the pulley. These circuits both reduce the voltage to the motor once up to speed as this reduces the motor noise and they need the platter inertia to keep going. Could be the Hercules doesn't provide quite enough torque at 45rpm or the sinewave at 45rpm isn't quite as clean. I've had a few Hercules supplies in here but don't recall the 45rpm behaviour. Maybe some Hercules users could chime in here and tell us if they get a similar hum on 45rpm.

Gary

LP12/Cirkus/Radikal/Kore/Ekos1/Tkable balanced/Uphorik/Krystal/ADSM/1/aktiv Akubariks
Visit this user's website Find all posts by this user
Quote this message in a reply
2017-04-08, 13:46
Post: #10
RE: Hercules, very quiet hum @ 45
(2017-04-08 13:40)bettermusic Wrote:  
(2017-04-08 13:28)allthingsanalogue Wrote:  
(2017-04-08 12:19)bettermusic Wrote:  The hum is not because the motor is being driven outside the 60hz range. A Lingo will drive it with the same frequency for 45rpm and the motors don't hum with a Lingo. All Lingo supplies require the 21mm motor pulley.

Faulty Hercules then? As it's dead silent at 33. If you touch the pulley on 45 without a belt on it just stops but continues to vibrate.

The Lingo and Axis are the same way, (except there is no hum) at 45rpm they require the platter to be on or it just stops when the circuit goes to low voltage or if you touch the pulley. These circuits both reduce the voltage to the motor once up to speed as this reduces the motor noise and they need the platter inertia to keep going. Could be the Hercules doesn't provide quite enough torque at 45rpm or the sinewave at 45rpm isn't quite as clean. I've had a few Hercules supplies in here but don't recall the 45rpm behaviour. Maybe some Hercules users could chime in here and tell us if they get a similar hum on 45rpm.

Thanks Gary.

I've now put myself on the list for a Lingo 2 with Cymbiosis, unless I decide to buy a brand new Lingo 3Big Grin
Find all posts by this user
Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 1 Guest(s)