a9050lx
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Posts posted by a9050lx
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Run what you got. Box of parts? At least build something.
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Don't think I ever heard a bad 6bq5/EL-84 amp.I have an old Fisher console amp I borrowed the outputs from and built two Simple push pull Tubelab amps,one with Fisher outputs and one with Olson integrated amp output transformers.The Fisher Output transformer triode amp is very engaging.
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Weren't the 18 inch drivers styrofoam coated or am I thinking of the 30 inchers? I also believe either the Patrician or the Georgian used the EV 848 mid horn?
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I hear details I have never heard before with any other speaker (76 lascala) air, sound stage width, depth, holey crap! Example, just listening to "Ain't superstitious" by Jeff Beck. Never knew how great that recording was. This with a rather modest Tubelab 6BQ-5 Simple push pull amp in triode mode,and with an old Polk Audio sub.
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I have a VTA driver board bought 1.5 yrs ago in order to rebuild an old rusty st70. I used the 12AU7 version, as I have a hundred of them laying around in some iteration. Very listenable amp.My wife initially bought the amp at a yard sale for 10 bucks or so with all original output tubes (proud of her, I wasn't even with her!). It sat for 20 yrs or so until I rebuilt it, Just felt I had to do something constructive with it, painted the chassis hammertone bronze. rewired of course.Really not an unpleasant sounding amp by any means.No idea if it distorts unpleasantly at 10 watts or so,as with LaScala's 10 watts will drive you out of the room. I think as a push-pull amp it sounds just fine.
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15 watt Edcor output transformers? Does a HK Citation II output transformer even do 75 watts? Probably, but 5 times the size maybe?
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Here's a fun one: Inside the vacuum tube (Rider, 1945) Should be able to download off the internet as a PDF.
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On 5/19/2022 at 3:01 PM, henry4841 said:
I am at the opposite of KT88 when it comes to tone controls. Have not had or used in a decade or more. It takes a lot of effort adjusting your speakers to your room but when done correctly tone controls are just another form of signal manipulation. More components in the audio signal path. It does take a lot of effort, time and expense to conform your room to your speakers. I am the camp of less is better. I have multiple amplifiers and preamps. None with tone controls. The one I use the most is a simple buffer with no amplification. The Nelson Pass B1v2.
Pass B-1 does sound good, sounds delicious loud. Surprisingly, reminds me of the FET-10 phono preamp I had years ago.Who designed the Fet-10? Yeah Nelson Pass.
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On 6/18/2022 at 5:59 PM, the real Duke Spinner said:
Larger amplifiers ate necessarily about Loudits more about reserve power and bass control
I runn 200wpc for this reason
Never get about several wattsbutits the peaks. !!
Reminds me of a pair of push-pull 2A3 amps I built.The guy who designed them (Henry Kuck) demonstrated to me 150watt peaks on these amps.Hope you're well Henry! Yes, they still exist!
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Holey crap.Tube amps and a plethora of home brew tube amps! God bless you guys for being maniacs! Any of you guys build JLH amps?
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If the chassis is unmolested, the transformers are good and the price is right, its a worthy investment.I don't recall ever being enamored of the sound but never heard a Citation II in a really good system either.Highly renowned for the output transformers, wish I had a pair of them to fool with.
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On 10/20/2019 at 1:14 PM, Jeffrey D. Medwin said:
Out of all the replies to this thread, what Tom1066 said rings truest to "me", about Crooner's ( seemingly experienced ) 8B updating approach.
I feel, one should not try to change " all the caps" or " all the resistors", as SOP - standard operating procedure, because it changes the SOUND of the stock amplifier.
However :
One can MEASURE, individually, methodically, all the caps, as to their uF value, and measure each cap as to their ESR , and determine if ANY are way out of spec, and needing attention.
Likewise, one can easily MEASURE, individually, methodically, all the resistors, to see if they drifted, and vary greatly from their intended ( schematic ) values.
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There MAY possibly be no parts that are GROSSLY out-of-spec. This might take up to 3 hours of time / labor to do and carefully document these measurements in 2019, VS this piece being around and unchanged, virgin, since about 1959 ... six decades !!
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I am sure I personally could easily improve upon the sound of this amp, by using well-thought-out new film caps, and highest-quality resistors.
But then, it is no longer a Marantz 8B one is listening to. That's the RUB !!!!
Have fun, but think twice, before acting. Its up to the Original Poster. This is just little-ole-me's " two cents " worth of thoughts.
Jeffrey Medwin
Well, you are not wrong with any of it!
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Seem to be respected in the high end community, never heard any of their equipment.
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Wish I didn't already have a pair, uh wait a minute.Can't believe theyr'e still available.
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On 9/17/2018 at 3:04 PM, jimjimbo said:
I wonder if they let Bob Carver proof that description before they published it.....I think there are a bunch of lofty claims here that are a bit......questionable, IMHO. It looks nice though....
Lofty claims sounds like Bob.
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Lascala is a fine instrument to test audible hum. I think building amps is therapy as much as a search for better sound.still, I run out of room.I just hope some of my equipment is used as intended when I no longer need it.
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Forgot to mention you may get a crapload of B+ from the transformer that was probably rated for 115 volts. Maybe too high a DC voltage for the Tubelab simple pushpull 6BQ5 tubes,which I think require about 320volts.You can (carefully) disconnect the secondary wires and see how many volts it runs at.Probably will be impressively high, unloaded, may not even sag much with a good load on it!
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Good start of a stereo amp.Nice heavy power transformer, choke, at least one of the 2 salvageable chassis.Find another similar output or buy a pair of Edcor Push pull output transformers.You could go to the Tubelab website and buy a Simple pushpull (SPP) circuit board.(4) 6BQ5/EL84 and (2) 12at7. You won't be disappointed.Wiring not that unusual of a mess.Most peoples point to point wiring is messy.Don't risk the transformers and yourself by electrifying those old capacitors.
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On 7/28/2019 at 9:22 PM, Emile said:
Congrats
Looks like a great job! Build an ST-70 about a year ago and was pretty pleased with it. Haha; but went back to higher powered SS amps
How about a low powered class A amp? Try a JLH 1969 10 watt per channel, or one of its variations.It sounds much more powerful than 10 watts and is a wonderful sounding ,simple amplifier.
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On 7/28/2019 at 11:04 AM, Dave1290 said:
Too stinking hot for coffee but I'm thinking about it. This Diet Dr. isn't werkin! Thought this would be a nice play this morning. Emerson, Lake & Palmer from 1970 and their first release. I won't get into the personalities of the 3 but they ALL meshed so darn well. Keith Emerson on keyboards, Greg Lake with the vocals and bass and Carl Palmer on the drums. One of the most successful progressive rock bands of the 70's w/9 Gold here in the US and worldwide sales of more than 48 million copies. They just did it ALL! Love my neighbors! 😂 😎
I remember hearing brain Salad Surgery for the first time, about 13.The album assaulted my senses aurally in a similar manner of viewing my first Playboy magazine.I still have a Japanese pressing of Welcome Back My Friends CD (1982?). Great live album.I also have an MFSL Tarkus I never opened , LOL.
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16 minutes ago, jimjimbo said:
Be wary of the big spiders that emerge from the boxes of banana plugs.
Cant' stand all that excitement, my hammer is waiting as the box is opened (3lb spider sledge) Any unbroken items are put into service.
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On 5/13/2019 at 9:19 PM, RobF said:
might look good inside a hut made of bamboo
Yeah, on Gilligans Island.Could woo Maryanne and Ginger over for awhile with some coconut cognac , (just to) listen to some Carribean music.
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Looks like a 208.
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If one wants reliability, my favorite is for the GE 6550a.
Looks like a great job! Build an ST-70 about a year ago and was pretty pleased with it. Haha; but went back to higher powered SS amps 
Marantz Tube Amps - new to me - advice?
in Talkin' Tubes
Posted
I will eventually gladly give away my cherished possessions to any people or persons who love my stuff as much as I do ( or did,lol).