Jump to content

Huge 833A tubes


jimjimbo
 Share

Recommended Posts

1 hour ago, Jeffrey D. Medwin said:

I have 1,000 NOS pieces of Eimac 35Ts for sale, if someone wants to buy them

Really?  Got any pics?

 

What else might you have for sale?  Anything as ridiculously boring as a 12AX7?

Link to comment
Share on other sites

4 hours ago, Jeffrey D. Medwin said:

 

  I have 1,000 NOS pieces of Eimac 35Ts for sale, if someone wants to buy them all, a MUCH nicer size, symmetrical. 

 

Jeff 

 

Hmm I have a good stash of the smaller Eimac tubes. I even have a filament transformer juicy enough to light up 3 35T's per channel. Not push pull but parallell.

 

 

 

 

 

 

 

Link to comment
Share on other sites

Very exciting indeed!  However, the real takeaway here is that you and Dennis share listening taste in terms of the amp’s harmonic characteristics and its relationship to the speakers with which it is tested.  One cannot assume that those characteristics will be universally appreciated just as some audiophiles find all tube amps to be unacceptable, and as we find SS amps to be unacceptable.  One other question is whether it is necessary to build an amp as complex as yours to achieve a result which is equally pleasing.  That, of course, is a question without an answer.  A certainty is that there is no amp in existence (mine included) which will interface with all speakers and listener preferences.

 

 

Maynard

  • Thanks 1
Link to comment
Share on other sites

Hi guys.
Since 2012, I have a self-made lamp amplifier with 833 lamps (Gu - 48 analogue from the USSR). I'll tell you right away, I didn't do it, but I'm not an electronics specialist. I just love listening to music.
Amplifier - single-stroke in class A, 55 W when using 750 W.
For 6 years I brought his sound to my preferences: openness, speed, timbre. In my opinion, and the view of many who listened, it worked. the room I rented, it's not my design.IMG_7046.JPG

9DDF36FF-773C-4A9A-AB99-2A62DB14C361.jpeg

IMG-0bf43c8d5d668d939b06827c407b28e6-V.jpg

  • Like 2
Link to comment
Share on other sites

3 hours ago, quadrokot said:

Hi guys.
Since 2012, I have a self-made lamp amplifier with 833 lamps (Gu - 48 analogue from the USSR). I'll tell you right away, I didn't do it, but I'm not an electronics specialist. I just love listening to music.
Amplifier - single-stroke in class A, 55 W when using 750 W.
For 6 years I brought his sound to my preferences: openness, speed, timbre. In my opinion, and the view of many who listened, it worked. the room I rented, it's not my design.

are these real Jubilees or DIY  -

Link to comment
Share on other sites

3 hours ago, quadrokot said:

Hi guys.
Since 2012, I have a self-made lamp amplifier with 833 lamps (Gu - 48 analogue from the USSR). I'll tell you right away, I didn't do it, but I'm not an electronics specialist. I just love listening to music.
Amplifier - single-stroke in class A, 55 W when using 750 W.
For 6 years I brought his sound to my preferences: openness, speed, timbre. In my opinion, and the view of many who listened, it worked. the room I rented, it's not my design.IMG_7046.JPG

9DDF36FF-773C-4A9A-AB99-2A62DB14C361.jpeg

 

15 inch woofers front firing on jubilees  cabs  -   bass reflex ----------------     can you elaborate on what you have accomplished with this modification , and any plans , specs you can share

Link to comment
Share on other sites

I had a Diy Jamboree based on original drawings from Dana Moore. The bass was powerful and large, but had a large peak of 12 dB at about 125 Hz. After which there was the same pit at about 250-300 Hz. Rock did not play in the absence of this range, there was no energy, the lack of which was not so noticeable in other genres. Unfortunately, the measurement screens were not preserved.
So, after consulting with Dana, I reworked Jamboree for direct 15 "speakers. The 200-300 Hz range got better, but the peak around 100 Hz remained big. I attribute this to Jamboree's own resonances. The bass seemed to play on the same note. , close to 100 Hz.
I was not able to reconfigure the crossover because I am not such an expert.
So I decided to make a box with a phase inverter for two 15 ".
The crossover was based on the ALK II, slightly modified its woofer link, replacing the coil with a different denomination.
All my dances around this wonderful Acoustics ended with an incredible sound. I am very pleased.
This is probably offtopic, the same theme for the 833 lamp.

  • Like 1
Link to comment
Share on other sites

Іn six years of living with an amplifier on 833 lamps, I was able to compare it with many other tube, transistor and PWM amplifiers. These were Quody, Diinako, Scott, Audio Sculpture and others. None of them could match the 833 lamp. She paints great musical images, for example, the singer was standing at full height. The piano was as wide as natural.
Yes, high power consumption, in the anode of 1650 volts it causes respect and caution. It is hot near the amplifier in summer. But for such a sound you can tolerate everything.
One-stroke amplifier 55 watts in class A. At first, my amplifier worked with Jamo 909 R. It revealed their full potential.
Modern PWM amplifiers are better in bass, but they have not yet reached such midrange frequencies as the 833.
I liked that my one-beat play rock easily.

  • Like 1
Link to comment
Share on other sites

  • Moderators
On 6/27/2020 at 4:04 AM, RandyH 000 said:

are these real Jubilees or DIY  -

Apparently plans of the Dana Moore copies of Jubilee.

 

 

Funny how everyone wants to thank Dana Moore, but not PWK/Chief Bonehead. Probably because they PWK didn't publish plans for everyone to make. He is from the Ukraine so I'm sure he can't get Jubilee bins.

 

The state of the art has grown significantly from that clone/copy bin in what Roy is doing.

Link to comment
Share on other sites

Hi Jimjimbo,

i would be interested in buying a couple of your 833s.

I have a high feedback design underway based on Frank Blohbaum's Multiplied Transconductance Amplifier (MTA) philosophy.

1500V @ 180mA into 5K:6R OPT

Contact me off list if interested

timgrindell(at)gmail.com

stay safe

tim

 

Link to comment
Share on other sites

  • Moderators
3 hours ago, dhsettim said:

Hi Jimjimbo,

i would be interested in buying a couple of your 833s.

I have a high feedback design underway based on Frank Blohbaum's Multiplied Transconductance Amplifier (MTA) philosophy.

1500V @ 180mA into 5K:6R OPT

Contact me off list if interested

timgrindell(at)gmail.com

stay safe

tim

 

@jimjimbo so that he sees this.

Link to comment
Share on other sites

9 hours ago, dhsettim said:

Hi Jimjimbo,

i would be interested in buying a couple of your 833s.

I have a high feedback design underway based on Frank Blohbaum's Multiplied Transconductance Amplifier (MTA) philosophy.

1500V @ 180mA into 5K:6R OPT

Contact me off list if interested

timgrindell(at)gmail.com

stay safe

tim

 

Hi Tim, sending you email.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...