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Old 20th October 2003, 12:47 AM   #31
45guy is offline 45guy  United States
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Hey Jan,

I love the look of your 30B amp. Can you tell me more about the driver stage. What are using on top of the 27 tube, a pentode? I ask because I just finished a 45 amp with an MU stage consisting of a 76 and a 12HG7. Sounds fabulous but needs lots of drive from the preamp.

Tom
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Old 20th October 2003, 12:49 AM   #32
45guy is offline 45guy  United States
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Sorry, should have been 300B amp. I cnat' tyep tonighy!!
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Old 21st October 2003, 04:35 PM   #33
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Hi Tom,

I am indeed using a pentode, it is the D3A. It is also in a mu-stage. The 12HG7 I know well and is a good sounding tube. The D3A has just a little bit more uh .....punch. My preamp als using a mu-stage with the Ba tube (old Posttube).

REgards,

Jan
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Old 22nd October 2003, 12:05 AM   #34
45guy is offline 45guy  United States
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Hi Jan,

Hummm..a D3A. I have never run across that one. I'm guessing they are not too common here in the US. I found the E180F though. Similar? Do you need lots of drive from the preamp to get to full output on the amp or will 2 volts at the input get the job done?

Thanks,

Tom
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Old 22nd October 2003, 02:39 PM   #35
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Hi,

Well the D3A is a common tube here. Not to expensive, and works great. The 6688 (e180F) can be used instead, butr the E280F is better.
When playin at maximun volume my ears are hurting (really) so my CD-player (2Volts) is enough for the preamp to drive the poweramp.
Don't know your preamp, but otherwise build a mu-stage preamp with the 27, or the 26, or the 76. SOunds good, with lots of drive.
Also the ECC99 sounds in very powerful, with lots of detail.


Regards,

Jan
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Old 22nd October 2003, 04:00 PM   #36
45guy is offline 45guy  United States
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Hi Jan,

Thanks for the info. As a matter of fact, I have been playing with the 27 lately, as well as the 12B4A. I have had a pair of the ECC99s staring at me on my desk for a few months too. Just not enough hours in the day!!

Thanks again,
Tom
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Old 18th November 2003, 06:03 AM   #37
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Default Integrated EL34 Amp

Hey guys, just posted a couple pics of my latest amp that's been my bane for the past year or so. Still needs sides for the vol control and chassis, I'm thinking a lighter colored wood. The tube count is 29

Based on a couple of Rozenblit's designs, it uses the grounded grid preamp with 12AT7 gain mod, the outputs are/were based on the super-compact 150w monoblock, but I had so much trouble with the EL509s during testing that I changed over to EL34s that I had on hand. Plates are at 700v, and screens a little over 400v. I tossed in a switchable active EQ (6 tubes on the far left), and tube regulated and rectified power for it and the preamp. Oh, and it weighs an absolute ton!

The far left transformer is for the filaments only, there are three more hidden under the chassis for the pre/eq power, onboard electronics (remote&processor) and for the EL34 bias. The 6AF6 dual eye tube is driven from the EL34 screens and has a gain control on the back. The LEDs on the front indicate remote,preamp power, filaments, poweramp power, and standby/sleeptimer. The orange indicators along the front are neons and backlit letters that correspond to the knob functions. The other cool trick is the motorized volume knob. As you turn it, a growing ring of red follows the position. A toggle on the back puts it into dot mode. Full red indicates half volume.

In the glass window on top is a microprocessor that runs the show, built-in sleeptimer, internal temp checking, selectable relay inputs, delayed warmup for both pre and power amp HV, and some other goodies. There's also a 12 channel infrared board hiding under the main chassis for the remote.

Besides the wood sides I need to finish the software interface for the blue LCD display.

Wow...never again!

So what do you think?
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Old 18th November 2003, 02:15 PM   #38
dhaen is offline dhaen  Europe
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Now if I didn't know better, I might believe you started these 2 threads in preparation for this

It looks......hideously beautiful...
Does any sound come out yet?
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Old 19th November 2003, 06:17 AM   #39
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Who, me? I actually get a real kick out of seeing everybody's work, it gives me inspiration to know I'm not the only one afflicted with this illness!

Yeah, it amplifies sound too. I'm still warming up to it compared with my last amp that was based on a 40's PA design. PP 6L6s, 5U4 rect and 6SN7/6SL7s to round it out. Great sound but runs out of oomph when I really crank it up (estimate 30w or so).

What I really like about this amp is how quiet it is, no hum, no buzz, just the sound of amplifying silence I have a stereophile mag test CD and it sounds great, really bringing out woodwinds, vocals and piano, but I prefer modern rock, pop, and some other eclectic stuff and that sounds too solid state, too bright I guess. I admit, I play a lot of MP3s and the iPod made testing a breeze, but that only adds more variables to the mix. The Essential Billy Joel CD sounds nice though.

I don't think my speakers help, they're just cheapies...maybe it's time to move up to the majors? Any suggestions?
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Old 7th March 2004, 10:25 PM   #40
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Default Morfeus can you post a schematic?

for your 6N1P-6N1P-6C33C-B?
amp?

Cheers,
Bas
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