seti
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Posts posted by seti
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We thought of a few ways to make these even quieter so we are going to do further tweaks to these and then put them back up for sale.
These were completely gutted and rebuilt. My friend Chris Hornbeck guided me through this one as it drove me crazy. Have been tweaking this over the last 4 months after the major rebuild.
Deviations from stock are we added adjustable bias, added bias test point/pots, improved potted choke, snubbers, zobels on outputs, high graded medical power cords, and removed 12AU7 gain stage but otherwise stuck to schematic. Oh addded bottom plates and fet.
They are composed of the following tubes 2 x Chatam 5AR4, 2, x EH KT90, 2 X Sylvania 6SN7GTB, and 2 X GE 0D3. The caps are orange drop, solen, nichon, JJ and Hayseed. I dig the light show the 0D3 puts off. These amps are overkill galore for klipsch. I can throw in extra quad of EH6550 but I prefer KT90.
I have been listening to these carefully for the past two days on Belles with a Mark Levinson LNP2 preamp and a digital streaming source. They sound good but have way too much power I run gain at 1/4 on the amps. These just have too much power for Klipsch IMO. I'd love to run these on some modern electrostatics. I think they were better suited to some B&W's I also tested them on.Anyway... Ain't shipping these but could take to subfest in Hope in November. They are available for demo in Downtown Little Rock, AR.
$850
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Price drop. Also uploaded video.
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The Heathkit AA-151 has a cool aesthetic but it was the worst EL84 amp I have ever heard. It was blasphemous. This amp created a ton of gain and then used it up all through the amp very inefficiently. It was also noisy. The tone controls were horrid. The phase switch caused issues as well. What a way to abuse top-notch tubes and transformers.
We removed an entire stage. We cut loose all tone controls and removed phase switch. The input wiring is now Mogami shielded wire. The power cord is a medical grade three-prong. The phono stage was replaced with a generic RCA phono stage. Caps used are a mix of orange drops, solens, polystyrene, nichons and in power supply Hayseed caps. The tubes are top notch Mullard GZ34 and mullard EL84. It does not have as much gain but sounds much more like an EL84 ultralinear amp. It is quiet at idle. This was rebuilt to be a daily driver.
This was built for me to keep forever so I did not watch my spending but now I have an opportunity to buy something I've always wanted so I am liquidating gear. I will have a monster pair of monster mono amps for sale as soon as we get the final tweaks done. If you have ?'s message me. Thanks
I don't want to ship, but if you're in central Arkansas, you can audition on Belles. I can also deliver to Hope at the SubFest in November.
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Those are great! A friend is a faux painter and he has helped me with my Belles. They can work wonders with trouble areas.
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Oh man this one is cool. Doesn't it also function as a crossover.?
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I just got a really nice Intact Audio Stereo Autoformer Volume Control....
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My friend and I finished another pair of amplifiers. These were a real mission. I spent so much time on these. They are supposed to be 90wpc which they are but they clip like crazy. They are super clean up to 75wpc.
2 x 5ar4, 2x od3, 2 x 6sn7, 2 x kt90..... There was a 12au7 preamp stage but we ripped it out. We add JJ and Hayseed caps and also two test points and pots for setting bias. They are still pretty much Allen 90 organ amps but with a beefed-up power supply.
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If it is the EL84 101 I would have it restored. I did mine and it might be the best sounding vintage piece I have. It is so good and stable. The only thing left are those nast ols rca jacks.
Good luck that is a great piece of gear.
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2 hours ago, rigma said:
Great work as always!
You were the first to push me towards DIY. THANKS!
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7 hours ago, henry4841 said:
I misunderstood the kind of hum you are having. I was under the impression you were talking about mechanical hum coming from the transformer itself but what you are saying is you are hearing hum from your speakers. Sometime it can frustrating finding hum coming from the circuit itself. I like the software program called Arta which will show which you have 60hz or 120hz with ease. Distinguishing 60hz from 120hz by ear is not something I am good at but is easily seen with Arta or any distortion analyzer.
If it is noticeable with 84db speakers you definitely do not want to hook it up to Klipsch speakers.
The hum could be circuit or transformer laminations or maybe both.
Yeah we still got some work to do. I'm optimistic we can knock the hum down. You know how it is when you just finish a big build and your just amazed any sound comes out at all. That is how I am anyway. I'm curious about the actual power rating and distortion measurements. That should follow.
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2 hours ago, henry4841 said:
As I am sure you know transformer hum is usually associated with being pushed to hard. Unless they are unreasonbly hot I would probably just turn the music up until you can no longer hear the hum. Being older than the amps I hum a little myself.
Excellent looking rebuild.
I don't think it is being pushed too hard as it is running lower voltage and current than spec. It was over 600v now it is 550v. The 0d3 cuts the voltage to the driver stages to around 300v. We even removed a preamp stage then installed a larger potted choke. All the caps are cool after an hour of running. All the transformers and chokes not even warm. We are going to do some distortion and power testing and then try to find the hum. I can't tell if it is 60hz or 120hz right now. I've never had a tube amp this powerful. My bench speakers are 84db1w1m if I hear hum on this I'm scared of 107db 1w1m.....
This was something I had to get out of the way. If I can get it to a point where I am happy with it I might ebay or audiogon it so I can buy parts for other projects.
Thanks!
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2 hours ago, mikebse2a3 said:
Thanks I also forgot to mention they are dated June 1958. 65yo....
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I bought these monoblocks many years ago from a Little Rock Central High School teacher. I sent them to hot glass audio for a rebuild. Anyone who remembers that con knows it was a miracle I even got them back. He broke all NOS tubes in shipping. I sold them to my brother because I was frustrated but he just sold them back to me. The nightmare continues. I completely gutted them and rebuilt them from scratch but I did have professional help. I added bias adjustments removed a 12AT7 preamp section and upgraded power supply with a beefier choke and caps. The power tubes switched from, 6550 to KT90's which are from the collection I inherited from Daddy Dee. Thanks again to Daddy Dee. The tube compliment is 2 x KT90, 2 X 5AR4, 2 x OD3, and 2 X 6SN7. They sound really good when turned up but still a little transformer hum to work out. I need to tighten them down. Not sure I need freaking 90 watt amps.
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Just looking at the position of the speakers and the substance of the room. That room is hideous. Speakers not in corners. Pathetic setup.
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For what it is worth Sovtek and EH are monoplate 2a3. Price a vintage 2a3 monoplate and you will understand lol...
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The sale and liberal use of old tube brand names is disingenuous.
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Find a faux painter. I have a friend who can paint any veneer. A good faux painter can make scratches or damage dissappear.
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2 hours ago, mark1101 said:
Have jury duty this week. So far excused Monday/Tuesday. As long as I'm excused Thurs and Fri I will get last minute flight/room/car and should be there. Somebody please save me a seat in lab listening room late Friday. Have to hear those Jubs again.
Awesome!!!!
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On 3/4/2023 at 7:55 PM, MMurg said:
From https://www.klipschmuseum.org/blog/2023/2/14/pwk-birthday-bash-2023
Friday, March 10 – Listening Sessions at the Klipsch Lab featuring JUBILEES!
Max 10-12 people per session! Session times: 10:00 AM-12:00 PM, 1:00 PM – 3:00 PM, and 3:00 PM – 5:00 PM
MUST pre-register for the Listening Sessions at the Lab! To register: email beckie@klipschmuseum.org
(Include your name and session time preferred.) (Free Event)
Funny thing is I think I am the one that posted that lol.......
Thanks
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22 hours ago, Chief bonehead said:
I will have the jubs setup on Friday in hope engineering listening lab for those who want to hear them in a typical listening room. We will also have the mclaren 905’s protos at the visitors center playing. I hope to have it where you can listen to your own selections.
What time does this start on Friday?
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Excellent see you guys there... I wouldn't miss another opportunity to hear the new and improved Jubilee's!!!!!!
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Anyone going to see any of the bands or listen to the Jubilee's? If you haven't heard the Jubilees they are a must hear.... It looks like there are two opportunites to hear and see them Friday and Saturday... Maybe @Chief bonehead will chime in...
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8 hours ago, richieb said:
For shites and grins let’s say the kickstarter falls short of the goal for publication. Money is returned and no copies
are printed. For all the work and hardship(s) people have endured what sense does it make to basically call the
project a failure and publish nothing? We see “prototype” books, where it will be printed, on what materials, etc. and
yet it’s possible a tangible product gets the axe? This makes no sense -
This is just how crowd funding works. I'm cautiously optimistic we will make it... If we don't make it would you like to publish for the museum? LOL...
Klipsch Heritage Jubilee vs. Underground Jubilee Upgrade
in 2-Channel Home Audio
Posted
Congrats guys 8-)
My wife has bought Belles for our living room and approved new Jubilees for music room... Better than a motorcycle 8-)