Topic: Dana's 7193 preamp

[edrel sison]

I was asked by Dana to make him a horny preamp. Just finished the bare construction for now but will continually update as the work progress. Here is the working preamp:



 

[bono]

edrel,

YOU'RE THE MAN!

[alexg]

I "heard" that it is a very quiet preamp, no hum or buzz!

Way to go! How does it sound? (I have a pretty good idea how it sound.)

Congrats to Edrel and Dana.

[rascal101]

Sir Dana,

Padinig nung bagong toy mo pag natapos.

[edrel sison]

yes it is. was surprised to be able to get that hum out of the equation. credit goes to alex for sharing his thoughts with his very own diy 7193. later on i will take a view of the inner chassis. am still fixing some things in there..

[markmlists]

Congratulations to Edrel and Dana!

[gutchy]

sir Dana listening session tayo pag natapos new toy mo... Congrats!

[rascal101]

Sir Dana,

Akala ko wala kang pambili ng bagong gears

Hindi ka siguro makatiis

[oweidah]

HORNY its getting hot in here!!!

congrats etivac tuberos!!!

dana, yan pala ang incumbent flavor of the month mo..

[jakeadriano]

bro pwede ba ma home audition yang me sungay na yan?

[cybermms]

Sir Edrel,

I can settle for the Horny section na lang!! He !! he!!

Pa-audition din.

cyber

[Superman]

drel, pahiram

[ATJr.]

good on you edrel....

mauubos stcok ni gerry ng horny tubes.....

[alexg]

Mauubos talaga ang stock ng 7193 once people hear this preamp!

It sounds like "the singer and the band" is HERE!

Of all the preamps that I have the pleasure of listening this is my favorite, next will be a 12b4 preamp.

Unfortunately, the 7193 is quite susceptible to hum and interference, but once you take care of these problem, it is a sweet sounding preamp, not too colored, just enough for good vocals. I did a side by side comparison of preamps based on the 7193, 12b4 and a 12au7, the 7193 and the 12b4 (ArnoldC's 12b4 circuit) are my #1 and #2 respectively, the 12au7 (old foreplay) is #3.

The original design uses plate resistors and cathode resistor (no bypass cap), TonyT suggested for plate choke loading on the first 7193 that Edrel made.

On my build, I used two smoothing chokes for the PSU, a tube regulator (which I cannot hear the difference if I take it out, but it looks COOL!) and no electrolytic. I used LED cathode biasing on mine with plate chokes, and I like what I heard. I will try cathode resistor someday.

Anway, Dana's 7193 preamp is version 3... Of all the three 7193 preamps that I know (Edrel's original, mine and Dana's), Dana's should be the best. Edrel further improved the PSU and wiring and Dana's is hum free.

I hope that Edrel can finish it soon. 

[markmlists]

Collaborative design effort pala yan...
Ganda rin ng chassis work (mukang ready sa hardwood sidings as well).

[oweidah]

WTF WAAAT? totoot ba narinig ko? - the price is so very right! presyong 'tol! sagana sa rekado at sahog... trannies/chokes pa lang ulam na! nice shiny chassis pa- simple pero rock!

sana magkaron uli si gerry ng stock or ibang exotic tubes naman. 

[dana]

Uyyy...Im missing the fun.
Posted na pala...
Just got logged in today...absent po khapon sa opis, where I do most my online ek ek...

Firstly, the thread title should be...EDREL's CORNER: Audio Toys,Transformers, Tubes, Tinkerings, etc.

Edrel, please re-title it., since I wont be able to sustain it. I mean, u have many things to offer in the forum that others
have yet to discover....

Secondly, about the 7193 preamp, It was love at first sight with that horny tube...medyo kakaiba kasi sya, cute na  with nice
matching specifications sheet pa raw.  My instinct tells me, how  could I go wrong. Tonyt, Owediah, Edrel and Alexg
like  them too and offers technical services for free , tapos may Mang Gerry 'The Tube Magnate'  pa tayo na very accomodating...kaya I went  ahead na...DEAL, kumbaga...

The last question is to DIY or asked Edrel... I went to see and chat with Edrel first and visited his plant (actually,
his 'audio playground' ), since we are just neighbors here in Cavite. I asked Edrel finally to commision me this
horny preamp.

I went to Edrel for his experience and resources. Edrel makes fine transformers : output,power type, chokes.They are accurately machine wounded using brand new & not recycled parts, that is, wires,cores...Added bonus, he likes Audio too and is deep into Audio tubes ( you should visit his playground & see his stash of exotic tube collections here and there, im sure dami pa nakatago sa playground nya )...

About the 7193 Preamp Construction by Edrel:
The chassis is very nice:Aluminum plate (t=?), with hardwood plinth base on the sides & back
The Layout is very clean.
7193 tubes (2pcs, national union brand). 6x5 ( 1 pc, rectifier tube, rca brand)
The wirings and points are cleanly soldered and shining.
Two inputs/1 output feature.
The parts used, Edrel only knows ...He is choosy and  has  lots of them in stock  to choose from, dpende sa experince and feel nya).

About Initial Sound Impressions?
Im not so good describing what I hear.But I liked much what I heard.
Initial Sound impression during the initial power up:
Hum and noise problem is not there, Edrel tamed them out.
The low to high frequency response is there and seems neutral to me & flat. Overemphasis in the fresponse was not observed.
The vocal  quality is luscious, the instruments are airy.
The music is very involving.In short, Cute ,Maganda  at Malandi sya tumunog .

Special credit also as mentioned by Edrel, goes to Alexg for improving the circuit which I believe Edrel applied in my
preamp.Alexgs' preamp uses the OD3 tube, yung sa kin wala .

Our Man, EDREL went back to his lab to do some more tweaks, I understand: beefed up more the psu and do the  other magical tricks.

When finished, the chassis Aluminum plate will be black, sporting a chrome plated bells for the  chokes and stain-finished hardwood plinth base.

Couldnt agree more with Bono, Edrel is the Man
Just pm this nice guy if u have some requirements: audio diy,transformer, parts...
With Edrel's expertise/resources, Im sure he can do a lot of favor to the local Audio Community first then who knows, with internet thing, baka mag-global pa .

In the coming days, Edrel im sure will gladly share the circuit diagram to those who want to make their own, for this is the essence to enjoy this hobby. As AUDIOKARMA quotes, All Audio, No Attitude.

Sa mga Audiofools who posted, sure naman, u will get to listen it sa haus with matching food  session, kayo pa!
My problem now is where to match it with - i told you, love at first sight lang talaga nung una...
Might as well pair it up temporarily with  my Pioneer SS vintage, SA-8800II ( with preamp-main amp buss bar connection).

Glad to know that I made the right decision, 7193, EDREL & Audio BIs .
This is a super cool looking horny audio  thing!
And its' my toy 

Edrel, please explain  further what you cooked for me,kinakapos na ako sa adjectives

Edrel, re-title it  please, pa humble ka pa jan...post the other toys u made and still being cook-up
Danas' pre amp is just  a starter...

Thanks!


Oweidah-san...pls pm Edrel for pricings.. I actually,reserved two pairs of 7193- one pair (which alexg eventually got) was originally intended for you...

Rascal...kaya di makabili ng ibang gears because of this ...now you know...

Hello Mang Gerry, please take hold of your 7193 stocks at baka may mamakyaw na naman.Please set some quantities available to give others interested a chance to try this

Alexg, year of the horns yata ngayon.Bubuhayin mo na ba ung unicorn mo, 832s???

[edrel sison]

To all those who have expressed excitement and congratulatory remarks, salamat po. Now i would like to mention that this is not my just my work but an effort made from several discussions about the very first prototype and succeeding diys made after the 7193 tube. I was hesitant at first when i glanced at the looks of the 2C22 (7193) but since Gary Kaufmann has very nice comments w them, i decided to make a similar preamp out of his circuit:

http://www.the-planet.org/linestage.html

Going on further, i found out that the 7193s are very susceptible to hums and oscillations. Well, i am a guy who doesnt mind some hums as long as it does not interfere with the musical program, and they are microphonic too but the lush sound that has came using this tube, to me shows a lot of promise. Tony T (many thanks to him) who had paid me a visit brought along his diy chokes and suggested to install them w the proto. I liked what I heard after installing the chokes. Here was the old prototype:



Now alex after i posted this pic at his own diy thread expressed interest with the 7193s. Rest is history. He decided to make a choke loaded 7193s, led bias pa..Now since he and his wife are very sensitive to hums, he decided to "usually" cut short his time sa office  and make research and trials to exorcise the hum demon, finally reducing it to a very tolerable level. His findings, i implemented with this preamp (swerte ni don  )

Am not through yet w the pre nagtetweak pa, to those who would like to audition pwedeng pwede, we would like to bring the best out of this preamp so that listening comments are most welcome. Time out muna, punta ko sa lab...

[edrel sison]

front:


side:


back:


bottom: coming soon

[oweidah]

"My instinct tells me, how  could I go wrong. Tonyt, Owediah, Edrel and Alexg
like  them too and offers technical services for free , tapos may Mang Gerry 'The Tube Magnate'  pa tayo na very accomodating...kaya I went  ahead na...DEAL, kumbaga..."

*** sir dana, wala po akong technical expertise, miron lang ako 

[cybermms]

Edrel,

Feature natin sa  Alabang on July 6, 7 & 8 para marami maka-audition.

cyber

[dana]

"My instinct tells me, how  could I go wrong. Tonyt, Owediah, Edrel and Alexg
like  them too and offers technical services for free , tapos may Mang Gerry 'The Tube Magnate'  pa tayo na very accomodating...kaya I went  ahead na...DEAL, kumbaga..."

*** sir dana, wala po akong technical expertise, miron lang ako 

ok...e di, 'like them too'' na lang


Heard the toy again yesterday  at Edrel's playground to pick-up some toy...mas lalong gumaganda tunog...parang adobo, habang tumatagal,mas sumasarap

[christineG]

ok...e di, 'like them too'' na lang


Heard the toy again yesterday  at Edrel's playground to pick-up some toy...mas lalong gumaganda tunog...parang adobo, habang tumatagal,mas sumasarap

Don, wait till you hear the latest cathode biasing that I made.

I already sent the important parts to Edrel yesterday afternoon so he can try.

--AlexG

[edrel sison]

sir cyber by all means, wed love to showcase our work there, no kidding pwede kami magdala ng diys?

maiinip si dana, kakatweak abutin ng matagal..

alexg has to take credit of getting the best sound possible.. :)ka text ko yan kahit 12 midnight na!

[oweidah]

ok...e di, 'like them too'' na lang


Heard the toy again yesterday  at Edrel's playground to pick-up some toy...mas lalong gumaganda tunog...parang adobo, habang tumatagal,mas sumasarap

gusto ko ung madaming bawang...at p*kp*k ng manok...

saan ba yang playground na yan? piko tumbang preso tayo

tweak-tweak sed twitty d myna bird whistling "may bagong toy si dana...may bagong toy si dana" 

[dana]

Don, wait till you hear the latest cathode biasing that I made.

I already sent the important parts to Edrel yesterday afternoon so he can try.

--AlexG

thanks Alex for the continuing improvement efforts!
its getting interesting, wow.

grabe, ang ganda na nga eh...with the additional improvement  kamo, gaganda pa detail, to the point na malalaman mo  if the guitarist have long nails or kung  naka manicure lang

baka sa susunod na visit ko to listen e makita ko na in person si  Jheena Lodwick between the speakers

saan ba yang playground na yan? piko tumbang preso tayo

Edrel's playground is near my place of work too, EPZA Rosario Cavite.
Mga 1 hour commute time from Baclaran...

[southpeak]

sir edrel, congratulation on your new creation. i'm sure kung anong ganda sa labas, yun din ang ganda nyan sa tunog. iba talaga ang pinoy 

sir dana, congratulation on your new toy. why do you need a bom for if you already have this magnificent machine 
bagay kaya sa Lo-D HMA 9500 or Hafler XL280 sir? one of these days we have to meet and you have to introduce me to sir edrel para maka order din ako.. 

[cybermms]

sir cyber by all means, wed love to showcase our work there, no kidding pwede kami magdala ng diys?

maiinip si dana, kakatweak abutin ng matagal..

alexg has to take credit of getting the best sound possible.. :)ka text ko yan kahit 12 midnight na!

Edrel

Yup!! ORganize mo DIY group mo, sir. I will give you space!!

cyber

[bono]

Edrel

Yup!! ORganize mo DIY group mo, sir. I will give you space!!

cyber

Bro. edrel,

This will help other members to have a tube gear at affordable price.

Thanks Mang Rollie for your support.

[ATJr.]

tube gears at affordable price....that is a great possibility in these forums...

all you have to do is ask...