Johnny D's 700 Adventure

[speakerman1]

I'm here. My ramblings educational? Shirley ye jest. On the Carys I have what is like a standby switch. The Carys are strange in the way of tube amps. I need no load to turn them on. When I bias them they want no input or output. Plus way to much money in these to mess with. LOL

Larry

 

[soundude]

Hey Larry, yeh tube amps are wonderful..very hard to kill them even with outputs shorted...the transformer output is a winding so there is resistance even if the speaker shorts or you binding postsground out the chassis...you overload the s**t outta them and the still come back...
Whats driving the 6550's, what tubes are in the frontend? Does your amp have the cats eye? Green flouresnt circular tune in front, if correct 6E5.

 

[speakerman1]

I forget which tubes I went with. Don't remember the brand but they are 6H9C. I have a tubed CDP. Lee is building my tubed preamp, my phono amp is tubed. Don't have a tubed DAC. One day I guess.

How big is your room? Some big speakers dude. Do you have a cassette deck? If not I have a Luxman with an intermittent channel. Just pay shipping and it is yours. I may have a manual for ir. LOL May is the operative word.

Larry

 

[soundude]

Hi Larry
My big room is 16 by 20 which is theatre and sond room, wrpped in drapes over doubel 5/8 sheetrock and homoso filled cavities. ceiling over infinities id 3 icnh acoustical panels with fiberglass packed cavities. Room is totally acoustically dead. Other listening room is 12 x 16 with 5/8 rock and acoustical panels in ceiling...more for testing.Then i have a section of my basement for the building...Y are you going with a DAC, I use digital for my walkman only, digital is so compressed plus it converts it back to analog anyway just go full analog and keep the harse outta your music.
I like cassette but no room for anymore components...bare min. phono, 25 year old cd player, dvd player and reel to reel thats it. Most of my tube stuff is hand built other than my SS amp. I have 25 years of collecting tubes and equiptment and builds. I'm posting some pics.[attachment=4:1l8ashhc]Preamp with sub channel.jpg[/attachment:1l8ashhc][attachment=3:1l8ashhc]Homebrew 7591 100w monos and project mo200a.jpg[/attachment:1l8ashhc][attachment=2:1l8ashhc]sl-1200mk2.jpg[/attachment:1l8ashhc]

 

[speakerman1]

Nice looking Phono amp. Don't have close to that many years with tubes. I'm a baby. I run DACs, Anti-Jitter, Clocks. I learn things. Never thought a DAC would do anything. Boy was I wrong. LOL

Larry

 

[soundude]

here are some more, Refurbed MO200a's with stainless wrapping and covers[attachment=7:19zlo0in]Picture 002.jpg[/attachment:19zlo0in][attachment=6:19zlo0in]Picture 001.jpg[/attachment:19zlo0in]
This is cute looks like single ended amp...24 watt push-pull, tube 6DZ7, look hard 2-7189's in one envelope.[attachment=5:19zlo0in]Picture 007.jpg[/attachment:19zlo0in]
This one started it all, built this back in 80's original Mullard KT66's 50watts channel.[attachment=4:19zlo0in]Picture 008.jpg[/attachment:19zlo0in]This one is the same but with tube rectification, chrome chassis and chinese KT66's and BIG ass power supply...tons of low end.[attachment=3:19zlo0in]Picture 004.jpg[/attachment:19zlo0in]this one is a gift for my son, and those brewed black speakers go with it, acrylic controls that light blue and fisher trannies.[attachment=2:19zlo0in]Picture 006.jpg[/attachment:19zlo0in]Great sound here, 7868 100w a channel with chicago trannies.[attachment=1:19zlo0in]Picture 005.jpg[/attachment:19zlo0in]this is my first preamp that I built to run my first amp with the mullards, sorry for the dust but just using for testing purposes now since I built the other 2 from this design.[attachment=0:19zlo0in]Picture 009.jpg[/attachment:19zlo0in]
Sorry for all the pics just sharing, if anyone has intrest I'll share the schematics...enjoy.

 

[soundude]

Larry you need to find a old first or second gen cd player with a good transport, philips was the best one, solid very well balanced and double laser reader. Sony cheaped out in the spindle and motor area and they have tons of jitter and vibes and were very noise too.

 

[kevin]

WOW !!! Thats alot of tube stuff ! Never had one of those. My ole buddy Sutton has a bunch... he says they sound great !

 

[soundude]

They do sound really good, doin it long time, couriousty gets me and I find myself building another one...the speakers in your avitar what kind are they?

 

[kevin]

My buddy Sutton and I made those.. They are called linus array. They are about 6 and a half feet tall and about a foot wide and deep. Thats 12 five and a half inch drivers and 6 ribbon tweets ! Right now I have them bi-amped. got a PL 500 on the drivers and about a hundred a side from a Denon on the tweets. They dont have a lot of bottom but they are real LOUD AND CLEAN. Can not wait till LEE gets the PL 1000 done so I can really shoot the power to em !!!!

 

[laatsch55]

John, excellent craftsmanship. Impressive build quality. nice to see someone with pride in their work.

Kevin, Lee had a 16 hour assbuster today. May not get much done on it tonight.

 

[soundude]

Thanks Larry, can only do with what i have, like to build a nice thick aluminum face plate with 2 nice big VU meters and a lexan window so you can look inside at the tubes, but meters are hard to find nowadays and lexan is so expensive...I made couple acyrlic platforms for my amps and i could of bought a set of transformer to build another amp...anyway love creating these things.
I'm in for building a pair of 400w 10 tube EL34 mono's, need to have the trannies wound, have on paper now to get the parts and bring it to life!

 

[laatsch55]

From the womb to the tomb!! Love it.

 

[soundude]

Joe, aquired a couple computer 3" brushless fans, like to attach them to the heatsinks.
Theyre 12v, can I use the light circuit to power these? Don't know the current of the light winding is rated...

 

[Gepetto]

No John.
Transformer light output is 6VAC and your fans are most likely 12V DC. I never recommend running noisy motors on any rail associated with audio equipment. It just adds noise to your amp sound floor. Recommend you buy a low cost 12VDC wall wart and run them off of that.

 

[Skratch]

Men, I just rebuilt a series 1 700 with everything upgraded. New emitter resistors, AC wiring path changed, bias trannies changed, BR changed, PS caps changed, drivers and outputs changed and last but not least Joes board. I run this for my subs which I drive pretty hard into 4 ohms and my heatsinks still are not in any need of cooling fans. In fact after driving them hard (not quite to Mach 8 but pretty close) they are still pretty cool. In my opinion after you do a complete restore of these amps they are totally a different amp than they used to be.

 

[mlucitt]

Mark,
Agreed, they are different if you change everything. Some folks are just changing the main board and this will improve the sound but the drivers and output transistors will still get hot. I ran my 700B that way at full power until it shut down in an overtemp condition (the thermostatic switches worked!). Now, I have two 120V fans running at half speed (wired in series) and the amp stays very cool even at mach 8. The last 100W into my monitors at 9 Ohms (measured DC) makes a big difference too.

I will eventually replace the drivers and outputs, until then my fans keep things cool.

The other Mark

 

[laatsch55]

The first Mark, The other white Mark or as he will be known in the future----- Dr. Lucitt.

 

[soundude]

Yes I did the same changed everything but the transformer, and I do admitt and low levels the amp stays cool but as i get to the symphonic level the amp gets hot, not burning hot but near. Unfortunately my speakers are no where near the 9 or 8 ohm loads, the highest resistance rating of my arsenal is 4.8ohms and the lowest has to be Magnaplanars at 3.2ohms. Don't even think I have a or even owned 8ohm set of speakers, even my raw drivers for testing are 4ohm...
Haven't had a burning smell of a good blowup since I was just starting this field.
Mark and Mark, If your gonna blow it up do it rite, load her up...

 

[mlucitt]

I simply measured the DC resistance at the input to the JBL 3110 "Frequency Dividing Network." The instruction manual lists the specs for the low frequency driver as 8 Ohms and the high frequency driver as 16 Ohms. Although I have an old JBL Network Service Bulletin that shows the 3110 as a 16 Ohm crossover, I don't think it is that high. My LF driver is: JBL 2025HPL and the HF driver is JBL 2426J.