I was a little surprised too, but the dealer's staff are old friends and hook me up all the time, so I didn't want to press the issue.McIntosh almost never disputes a tube issue during the 90 day tube warranty
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McIntosh MHA200 Impressions
- Thread starter warrenpchi
- Start date
TSAVJason
Sponsor: The Source AV
I was a little surprised too, but the dealer's staff are old friends and hook me up all the time, so I didn't want to press the issue.
It is very odd. In 18 years of being a McDealer I’ve never had this happen. It does seem your dealer offered a good option for you though.
TSAVJason
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Is the anomaly the reddish area on the tube? What is it called when this happens to a tube?Who can spot the anomaly on this picture?
In the wake of an earlier post on this thread the unit went to McIntosh repair immediately through my favourite hi-fi shop. Thanks to them I was still able to enjoy an MHA200 in a form of a temporary replacement unit during the waiting. Now it is back, all good, one tube had to be replaced.
First newbe question: One tube? Are they not supposed to be matching pairs?
Second thoughts: I am completely new to tube amps. If this is a common issue with possible heavy consequesces, should it not be described in the manual with some illustrations? Are there safety circuits in the MHA200 that could avoid the heavy consequences in case the red plate tube goes off when it is not recognised in advance? (Sorry for the dusty picture, the mash was removed first time after two months of ownership)
Yes, that is. It is called red plating.Is the anomaly the reddish area on the tube? What is it called when this happens to a tube?
The protective mesh above the tubes also became quite hot, it was uncomfortable to touch, where it is normally just pleasantly warm.
Maybe that is how I have noticed it.
Some fun measurements after removing the mesh:
This is the normal tube. The red dot on the tube is the laser pointer of the temperature scanner.
This is the plate of the red plated tube
This is when I managed to hit the heating wire around the top of the plate with the scanner:
Interesting, thanks for the illustrations and explanation. I had the Ray Samuels Emmeline II “The Raptor” tubed headphone amp and now the McIntosh MHA-200 and have not seen this anomaly yet. Not glad that your tube red plated but good for me to see what it looks like.Yes, that is. It is called red plating.
The protective mesh above the tubes also became quite hot, it was uncomfortable to touch, where it is normally just pleasantly warm.
Maybe that is how I have noticed it.
Some fun measurements after removing the mesh:
This is the normal tube. The red dot on the tube is the laser pointer of the temperature scanner.
This is the plate of the red plated tube
This is when I managed to hit the heating wire around the top of the plate with the scanner:
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Suggested Rule #1 for MHA200 owners…
‘Don’t talk about Red Plating.”
Posted about mine yesterday and today my third McIntosh12BH7A bites the dust.
Enjoying a little solid state by way of Chord Anni as the McIntosh cools down for some new tubes.
‘Don’t talk about Red Plating.”
Posted about mine yesterday and today my third McIntosh12BH7A bites the dust.
Enjoying a little solid state by way of Chord Anni as the McIntosh cools down for some new tubes.
I’m finding the JJ 12BH7A tubes at several places for about $20.Probably because McIntosh is their biggest client so they price match to keep McIntosh happy. The 12BH7a doesn’t really affect the sound so that tube value from nearly any supplier is very likely going to keep the MHA200 sound signature in tact.
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Suggested Rule #1 for MHA200 owners…
‘Don’t talk about Red Plating.”
Posted about mine yesterday and today my third McIntosh12BH7A bites the dust.
Enjoying a little solid state by way of Chord Anni as the McIntosh cools down for some new tubes.
Damn. Can’t trust those basic Mc/JJ tubes.
Did not you say you went for Electro-Harmonix 12BH7 Gold tubes?Suggested Rule #1 for MHA200 owners…
‘Don’t talk about Red Plating.”
Posted about mine yesterday and today my third McIntosh12BH7A bites the dust.
Enjoying a little solid state by way of Chord Anni as the McIntosh cools down for some new tubes.
Yes and I used a set while I waited for McIntosh to follow through on my warranty… That took many weeks… They sent me a full replacement set of 4 tubes, drivers gave up first (noisey), and today the power tube red plating. Rolled in an unused pair of EH 12BH7 this afternoon and they work beautifully. I now have 2 sets of good EH power tubes and a couple of sets of Mullards (4024 & 6201) for drivers. No more McIntosh tubes for this amp. Been more tube changes in this amp than I care to count. I bought it with the illusion I wouldn’t tube roll as I have my Woo amps for that. Could not have been more wrong.Did not you say you went for Electro-Harmonix 12BH7 Gold tubes?
How do the 6201's sound in the MHA200?Yes and I used a set while I waited for McIntosh to follow through on my warranty… That took many weeks… They sent me a full replacement set of 4 tubes, drivers gave up first (noisey), and today the power tube red plating. Rolled in an unused pair of EH 12BH7 this afternoon and they work beautifully. I now have 2 sets of good EH power tubes and a couple of sets of Mullards (4024 & 6201) for drivers. No more McIntosh tubes for this amp. Been more tube changes in this amp than I care to count. I bought it with the illusion I wouldn’t tube roll as I have my Woo amps for that. Could not have been more wrong.
rreynolds
100+ Head-Fier
Replaced the stock tubes on my unit with Tung Sol 12BH7A and RCA 12AT7's. No issues and been used daily now for months.Yes and I used a set while I waited for McIntosh to follow through on my warranty… That took many weeks… They sent me a full replacement set of 4 tubes, drivers gave up first (noisey), and today the power tube red plating. Rolled in an unused pair of EH 12BH7 this afternoon and they work beautifully. I now have 2 sets of good EH power tubes and a couple of sets of Mullards (4024 & 6201) for drivers. No more McIntosh tubes for this amp. Been more tube changes in this amp than I care to count. I bought it with the illusion I wouldn’t tube roll as I have my Woo amps for that. Could not have been more wrong.
With headphones I find them more to my tastes than the stock tubes or CV4024. On the bright side when using IEMs. Need to get more time on them as the McIntosh power tubes were not up to par when I rolled the 6201s in. Foolishly I left them in till they red plated. My Sure SE846s, as an example, were unusable with the stock power tubes but are now decent but not great. My Utopias make me regret not ordering a few sets. The grade I bought are no longer available.How do the 6201's sound in the MHA200?
It seems that you're not the only one experiencing this red plate issue with the MHA200. I have a MHA200 coming soon, hence my interest into some of these issues. I'm looking at a set of Mullard 6201's as a tube option and I was curious to how they sound. The Utopia's is one of the headphones I'm looking forward to hearing with the MHA200.With headphones I find them more to my tastes than the stock tubes or CV4024. On the bright side when using IEMs. Need to get more time on them as the McIntosh power tubes were not up to par when I rolled the 6201s in. Foolishly I left them in till they red plated. My Sure SE846s, as an example, were unusable with the stock power tubes but are now decent but not great. My Utopias make me regret not ordering a few sets. The grade I bought are no longer available.
Is the red plating a tube defect or is it something the MHA200 doing to cause it?
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