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Maco/ Brute 75
- Thread starter 238
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Ordered the caps & already got them. The Brute 75s do not have the wire wraped resistor at the top of the tube. Should i add one?
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I recently was gifted one of these, the thing looks brand new. The tube wasn’t removed during shipping so UPS removed it during shipping, haha.
Anyone know where to get a tube for a cheap price? Hate to pay the prices I’ve seen for testing purposes, not sure of the working condition since I was told there was a relay issue with it.
Don’t mean to hi-jack the thread, figured maybe this would add a resource for this amp if others looked later.
Anyone know where to get a tube for a cheap price? Hate to pay the prices I’ve seen for testing purposes, not sure of the working condition since I was told there was a relay issue with it.
Don’t mean to hi-jack the thread, figured maybe this would add a resource for this amp if others looked later.
You can use a 8950 to check it with. Find a used one , long as it is not bad, could be one that is 50% or so. Just to test with.
The 8950, another expensive tube though more plentiful and a little cheaper than the 2057 from what I see. There is a rework kit for the 8950 so it may be cheaper in the long run to have it converted to another tube and eat a couple watts or maybe post a Wanted ad here and maybe someone will have a single tested tube they would hook him up with cheaper than ebay or tube surplus stores.
Heres a cheap allegedly tested pair of 8950's but theyre cheap because theyre getting kinda spent and some fool put stickers on the glass. Good for testing though.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/184014075437
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/184014075437
Had a customer bring me a Maco 750. "Tubes are all good" he said.
Only one of them checked bad. Found some through a local horse trader, and put one in the Maco so it had a complete set.
Another one of the customer's tubes flashed purple and died. Replaced it.
Amplifier showed just under 700 Watt peaks now.
For a while. Another of the 'original' tubes flashed and the power dropped to 500 Watt peaks.
The M2057 is not just expensive, it's risky, too. Even if it's a new zero-miles tube it may or may not hold up for long.
It was made by exactly one vendor, the GE plant in Owensboro, KY.
The story goes that it was a custom order for one customer. The "M" in "M2057" was for "Maco".
So they say.
73
Only one of them checked bad. Found some through a local horse trader, and put one in the Maco so it had a complete set.
Another one of the customer's tubes flashed purple and died. Replaced it.
Amplifier showed just under 700 Watt peaks now.
For a while. Another of the 'original' tubes flashed and the power dropped to 500 Watt peaks.
The M2057 is not just expensive, it's risky, too. Even if it's a new zero-miles tube it may or may not hold up for long.
It was made by exactly one vendor, the GE plant in Owensboro, KY.
The story goes that it was a custom order for one customer. The "M" in "M2057" was for "Maco".
So they say.
73
Really should. Could be that it had a ferrite bead on the wire at the plate cap. They tend to overheat, crack, fall off and disappear.
47 ohm 2 Watt resistor with four turns of wire on it should do the job.
73
47 ohm 2 Watt resistor with four turns of wire on it should do the job.
73
