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shn67

Any tube amp guru help identify components in schematic diagram ?

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Hi Guys

 

I am wanting to upgrade the capacitors and resistors in a tube integrated amp.
 

From the schematic, can you guys help me identify which passive components are critical to obtaining the best performance? The integrated amp is line magnetic 219.

 

Thank you all in advance.

LM-219IA schematic.png

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C106/206 are the coupling caps between the first two stages.  These are the most likely suspects for upgrade.

Next maybe C103/203  which are the cathode bypass caps on the input stage.  These can be upgraded to a "better" electrolytic or to a polyprop cap if you have the room.

I would first establish that the existing caps are "cheapies " and likely to benefit from upgrade.  LM do not seem to me to be a "home brand" manufacturer like some other Chinese brands that use crappy components and weirdo circuits.

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The question that  needs to be asked; Is there a problem, or are you just after a different sound?

What is it you are missing? Mid range? Bass? To harsh? To Mushy?

Have you heard better somewhere else?

Capacitor change in a tube amp of some reputation may just mean a side step or a down grade.

 

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3 hours ago, Ihearmusic said:

The question that  needs to be asked; Is there a problem, or are you just after a different sound?

What is it you are missing? Mid range? Bass? To harsh? To Mushy?

Have you heard better somewhere else?

Capacitor change in a tube amp of some reputation may just mean a side step or a down grade.

 

It always sounds better when you change components for more expensive ones.Well at least when you do not have another product the same with the standard components with which to compare it.

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1 hour ago, THOMO said:

It always sounds better when you change components for more expensive ones.Well at least when you do not have another product the same with the standard components with which to compare it.

And of course there is the time lag between changing caps. Unless there is a significant difference in sound quality, it is very hard to A-B test.

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17 hours ago, Ihearmusic said:

The question that  needs to be asked; Is there a problem, or are you just after a different sound?

What is it you are missing? Mid range? Bass? To harsh? To Mushy?

Have you heard better somewhere else?

Capacitor change in a tube amp of some reputation may just mean a side step or a down grade.

 

I hear mid range and bass is missing...

Sonic signature is more like solid state.

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22 hours ago, RoHo said:

C106/206 are the coupling caps between the first two stages.  These are the most likely suspects for upgrade.

Next maybe C103/203  which are the cathode bypass caps on the input stage.  These can be upgraded to a "better" electrolytic or to a polyprop cap if you have the room.

I would first establish that the existing caps are "cheapies " and likely to benefit from upgrade.  LM do not seem to me to be a "home brand" manufacturer like some other Chinese brands that use crappy components and weirdo circuits.

Thanks for the great info!

 

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What speakers are you using with your 219ia?

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Here are some info for the Singapore dealer upgrades..

 

Improved power supply
High Quality Speaker binding post

Singapore version MKI - $5800 (Silver ) , $6100 ( Black)
The power section capacitors upgraded to Mundorf & Vishay capacitors
with low noise rectifier. option of coupling capacitor includes Urushi capacitors, Mundorf SGO capacitors etc.

Singapore Version MKII - $6500
Additional - Duelund Cast coupling capacitors

 

 

original below

Line-Magnetic-LM-219-IA-10-C-eb83a1bc-73145305-970x1024.jpg.815962ff7be06ad7f3562b7dc977103b.jpg

 

 

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Have you tried using the different output transformer taps?

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8 hours ago, shn67 said:

I hear mid range and bass is missing...

Sonic signature is more like solid state.

The question about speaker compatibility (deanB is asking) is valid. Tube unfriendly speakers might have a too big a drop in impedance (not so much a problem for a tweeter).

With only 24 Watt output into badly matched speakers you will just miss out on to music.

A lack of bass and midds cannot likely by fixed with a change of capacitors.

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