Author Topic: alexg's DIY Tube Projects (Read 59907 times)

alexg · « **Reply #30 on:** Apr 06, 2007 at 06:35 AM »

Quote from: TonyT on Apr 06, 2007 at 03:09 AM

alexg,

if you are mounting the chokes underneath the chasiss, make them at right angle with each other to minimize interaction, if atop the chassis, get them as far away as possible...

Thanks for the advise.

I am still deciding if I will mount the plate choke top side or underneath. Most likely on the top and have the end bells and bracket chromed.

s2kov · « **Reply #31 on:** Apr 06, 2007 at 10:12 AM »

Hi Alex,

Gwafo ah!

Tlga ba'ng sa preamp chassis naka mount yung od3?

alexg · « **Reply #32 on:** Apr 06, 2007 at 10:33 AM »

Quote from: s2kov on Apr 06, 2007 at 10:12 AM

Hi Alex,

Gwafo ah!

Tlga ba'ng sa preamp chassis naka mount yung od3?

crowded na dun sa PSU

and besides, the purple glow looks good with the "hornies"

christineG · « **Reply #33 on:** Apr 06, 2007 at 11:03 AM »

Quote from: alexg on Apr 05, 2007 at 09:55 PM

Thanks.

Those legs are not as good looking as the UP campus figures' legs during our time.

uh-huh?...

recalling them bimbos again, are ya??

christineG

alexg · « **Reply #34 on:** Apr 06, 2007 at 11:15 AM »

Quote from: christineG on Apr 06, 2007 at 11:03 AM

uh-huh?... recalling them bimbos again, are ya??

christineG

Oooooppppps forgot that my wife is a member of the forum. There goes my audio budget!

alexg · « **Reply #35 on:** Apr 06, 2007 at 12:53 PM »

I was short of 1 pair RCA when I decided to put a simple toggle input selector switch.

The plate choke will be chromed.

Superman · « **Reply #36 on:** Apr 06, 2007 at 06:09 PM »

congrats alex!

PS: pssst, baka may spare kang 6922?

alexg · « **Reply #37 on:** Apr 06, 2007 at 07:28 PM »

Quote from: Superman on Apr 06, 2007 at 06:09 PM

congrats alex!

PS: pssst, baka may spare kang 6922?

Sorry, wala eh. 6922 is a reduced heater current version of the 6dj8?

ATJr. · « **Reply #38 on:** Apr 07, 2007 at 03:24 AM »

uy, ala peter daniels yan ah...

s2kov · « **Reply #39 on:** Apr 07, 2007 at 07:22 AM »

Hi alex,

Since the you're using aluminum chassis, i suggest using powder coat in wrinkle finish on your plate chokes!

alexg · « **Reply #40 on:** Apr 07, 2007 at 08:02 AM »

Quote from: s2kov on Apr 07, 2007 at 07:22 AM

Hi alex,

Since the you're using aluminum chassis, i suggest using powder coat in wrinkle finish on your plate chokes!

I had wrinkle finished line stage, hirap tanggalin ang dust. Baka pa-paint ko na lang sa office ko, flat black.

alexg · « **Reply #41 on:** Apr 08, 2007 at 05:28 PM »

Finished clear coating the top aluminum plate yesterday afternoon.

I spent most of last night and today soldering the components.

First time I turned it on, the right channel is quite distorted, after re-soldering some questionable solder, distortion is gone.

But the sound was still veiled, took another look at the circuit, found out I made a mistake in installing the bleeder resistor, the resistance is quite low, it was eating all my current. Replaced the resistor, and wow!!!

Here is the pix of the preamp without the skirts yet. Visible are the LEDs I used for biasing the cathode.

ATJr. · « **Reply #42 on:** Apr 15, 2007 at 08:55 AM »

alexg,

are those plate caps from zhiang?

alexg · « **Reply #43 on:** Apr 16, 2007 at 04:25 PM »

Quote from: TonyT on Apr 15, 2007 at 08:55 AM

alexg,

are those plate caps from zhiang?

Got them from Edrel, and I believe he ordered them from China, might be the same source.

BTW, am using Philips polypropylene signal capacitors, and they sound good!

j_albert22 · « **Reply #44 on:** Apr 18, 2007 at 03:09 PM »

pre sent u PM

alexg · « **Reply #45 on:** Apr 18, 2007 at 03:20 PM »

Sent you reply to your pm.

All my irons are wound by Edrel Sison (he has a tranny factory sa EPZA, Rosario, Cavite). He uses high-quality core meant for audio on all his transformers and and all are wound very accurately, am getting voltages that I specified. He is also deep into the audio hobby (tubes) that he has very good understanding of tube audio and can relate this to his transformers.

Try his irons, you would not regret it!

j_albert22 · « **Reply #46 on:** Apr 23, 2007 at 01:38 PM »

thanks to your input

alexg · « **Reply #47 on:** May 02, 2007 at 10:38 AM »

Quote from: oweidah on Mar 28, 2007 at 05:19 PM

para di ka ma-ear-fatigue sa pabasa, try sub mo 6n1p ng amperex 6dj8 - yung A-Frame or L-bracket or dimpled getter

tol swerte ni brod, napamanahan mo agad ng tube amp ah!

After trying the 6dj8 in place of the 6n1p, the vocals are ok, but for higher volume the sound is quite compressed and distorted.

I checked my circuit and 6dj8 operating points, my circuit has a very high B+ and I don't think 6dj8 is a 6n1p equivalent on circuits with high B+ (400VDC), it might do well if I reduce the plate voltage, so I would stick with the 6n1p.

alexg · « **Reply #48 on:** May 14, 2007 at 12:17 PM »

As Dana says on his 7193 preamp thread, "This year is the year of the horns."

My 7193 preamp.

The 832 PP amp that I will be building soon.

Close up

oweidah · « **Reply #49 on:** May 14, 2007 at 12:28 PM »

anakngteteng...only in my dreams 832!!!

puro horns nasaan ang buntoooot???

alexg · « **Reply #50 on:** May 14, 2007 at 01:20 PM »

Quote from: oweidah on May 14, 2007 at 12:28 PM

anakngteteng...only in my dreams 832!!!

puro horns nasaan ang buntoooot???

These tubes are quite inexpensive, contact your favorite tube magnate and friendly tube pusher.

These amps, if parts are chosen carefully can be built for less than 15K, if you can be satisfied with 4 watts of undistorted power per channel operating push pull.

Le_Stat · « **Reply #51 on:** May 14, 2007 at 07:09 PM »

Can the supply of these tubes be counted by the hands and feet or are these free flowing?

alexg · « **Reply #52 on:** May 14, 2007 at 07:14 PM »

Quote from: Le_Stat on May 14, 2007 at 07:09 PM

Can the supply of these tubes be counted by the hands and feet or are these free flowing?

Not free flowing, but enough to build a few dozen amps.

On the other hand, it is readily available from internet dealers. As far as we know, only a couple of schematic is available on the internet, so these tubes are not that popular, unlike the likes of the 6l6, el84, el34, etc.

Superman · « **Reply #53 on:** May 14, 2007 at 08:43 PM »

congrats alex...if you're building one again, please let me know...any chance with a phonostage??

alexg · « **Reply #54 on:** May 15, 2007 at 12:59 PM »

Quote from: Superman on May 14, 2007 at 08:43 PM

congrats alex...if you're building one again, please let me know...any chance with a phonostage??

I would love to do a phonostage, unfortunately, I don't have any LPs and I just sold my turntable, so I cannot test it.

edrel sison · « **Reply #55 on:** May 15, 2007 at 01:24 PM »

alexg · « **Reply #56 on:** May 15, 2007 at 03:21 PM »

Quote from: edrel sison on May 15, 2007 at 01:24 PM

What kind of tube is this?

dana · « **Reply #57 on:** May 15, 2007 at 04:34 PM »

what tube is that,much bigger physically than the 832s?

Horny Alexg, maganda yang plano mo regarding the forthcoming 832 build plans.im sure,dami rin interested jan...
Maganda cguro, purist horny set-up:

Horny 7193 pre-amp
Horny Power Tube Amp (832s ba?)
Folded Horn Speaker System Design (Fostex driver)

You're getting good at it and getting very prolific pa, im sure nagiging istorbo na trabaho mo sa hobby natin

...pati speaker building, pinasok mo na rin pala (fostex, folded horn combination, did i hear it right?)

.

alexg · « **Reply #58 on:** May 15, 2007 at 05:26 PM »

Carpentry is a hobby of mine too, in fact, kaya di matapos yung master bedroom ng house ko kasi kami nung wife ko ang gumagawa.

I started building speaker enclosures for my car audio, mostly subwoofers. Up to the point that I start making customized subwoofer enclosures made of fiberglass for my friends.

The last speaker project I did is: http://diyaudioprojects.com/Speakers/FE127E_SB_ag/FE127E_SB_ag.htm

After I finish putting narra parquet on my folded horns, I will post pixtures.

edrel sison · « **Reply #59 on:** May 16, 2007 at 10:20 AM »

Its an 815 (VT287). I will try to make a pp amp out of it. It has an octal base.

http://www.nj7p.org/Tube4.php?tube=815