I have a pair of BHK300s. Replacing the rail fuses with HiFi Tuning Supreme fuses along with the fuse to the valve input was an immediate and impressive upgrade. Replacing the main input fuse with a graphene sluggo and Swiss Digital Fuse Box was incredible on top of those other fuse changes. I expect the same treatment of the BHK250 will yield similarly spectacular improvements.
Still have the M700’s. Wanting to get the 1200’s but haven’t yet. Sorry if my previous post made that unclear.
If this helps tomhail, I have owned and listened to both the M700’s and the M1200’s and there is a sonic difference between them. Like everything in life, we are all controlled by a budget of some sort. Yes, there is a price difference as you well know, but it is not outrageous. When I first purchased the M700’s I thought I was set and and compared to my previous amps the M700 was a step up. It did everything as advertised!
But as I got more into listening to them in my system over time, I began to notice some sonic anomalies especially in the upper registers. It was sort of fatiguing to my ears, almost electronic induced outside of the music to the point that I subconsciously began to not listen as loud (60 to 70Db) and not for as long either.
The noise was somewhat hard to spot initially but as the M700’s broke-in and my ears became more adjusted to the style of sound the amps produced, is when I began to notice the harsh sound in the very top end of the treble.
I think that about a year or so later, when the M1200’s come out.
Well I was very intrigued and hopeful that the new amps with more money and research thrown at them would sound better. Smoother with less hash at the top end.
Well as luck would have it, I was very pleased with the M1200’s sound from top to bottom. Everything was there and noticeably so. Was the high-end hash gone?
Well no not completely but it was greatly reduced and was much more livable and not nearly as fatiguing plus I was back to being able to listen longer and the sound was far less tiring to my ears.
So in winding this post up I want to encourage you to if at all posable to move forward and get your hands and ears around a pair of M1200’s. You won’t regret it and your ears will appreciate it very much.
Remember, this is my opinion and my experiences with my associated electronic equipment and speakers. Your system will sound different to mine for a variety of reasons that we all know about.
I am not sure I have help you make any decision but it is food for thought. Good luck with what ever you do!
Cheers,
Sandrock
oh wow. Thank you for sharing your valuable experience. M1200’s are on on my upgrade list for sure.
I have the M1200’s and highly recommend them also!
I also started out with M700s and upgraded to M1200s. I could have happily lived with the M700s until I listened to the M1200s. I feel the sense of ease the M1200s have in their presentation makes them well worth the additional cost over the M700s.
I upgraded to M1200 from a set of amps that cost way more than double of them, and I was happy.
M1200 is so revealing that tubes, rack and feet, and cables all matter a lot to bring the best out of it.
Is this a twice in a lifetime deal now?
I had a sinking feeling I was making a mistake when I returned the first one. But got a better deal on the 2nd one 
Wait till you see the price on the third one!!!
I don’t want to throw any water on this 1200 love fest but Donald you are missing out. I’ve owned the M1200’s good amps but I’ve found out there is much better sonically for not much more money. My opinion of course so hold the rock throwing people.
I’m well aware there’re many better amps out there. But I explained before I have some big expenditures coming for the remainder of this year. So, no major audio upgrades this year. But with the upgrades I have done already my system never sounded better, and that was not the case at the same time last year. I can be happy for a while.
I will most likely buy upgraded power cables before you buy a new amp, but I’m not in a race. It will be a while.
Hope the pricing would be even lower, and include monoblocks, lol
You have and I have a short memory span.
Ha! That’s very true. We have been talking about the same things a million times for the past couple of years. Beyond that I don’t remember 
Paul172, I’m considering upgrading my Mcintosh MA352 integrated to separates. Would you mind sharing some of your recommendations for the 1200 competitors you referenced?
Thanks
George
So you are aware, he has a Gryphon integrated amp.
Your question is a loaded question, and the answer will have a lot to do with what kind of sound, and at what level of components, you are looking for.
I went the route of a clean solid state amp (Levinson 534, from the used market) combined with one of the cleaner sounding tube preamps (Conrad Johnson GAT-S2, also from the used market). My cost was roughly $17k total for gear that retails just under $50k.
If you are looking for excellent solid state gear, and are ok with spending $25k+ tax, a Gryphon Diablo 333 integrated is an excellent choice.
Another route is a decent DAC (with a volume control) feeding a very nice amp that also has tubes, like a BHK600. But again, price is getting up there.
The M1200’s are decent amps, and while they do not have the same cleanness of much more expensive gear, and do not have that class A solid state sound, they do have their advantages. They have plenty of power and have tubes in the input stage. They are good with female vocals and string instruments.
This is good, “useable” feedback.
Regards.