Author Topic: My Tube Journey (Read 199237 times)

at_sunset_blvd · « **Reply #990 on:** Aug 01, 2017 at 09:29 PM »

Happy Birthday Master Tony!

tony · « **Reply #991 on:** Aug 30, 2017 at 08:51 AM »

rewinding machine from Pakistan, thanks to Norman Santos.......note the 13mm shafting compared to the 10 mm of the china rewinder...
the shaft can carry heavier coils....

tony · « **Reply #992 on:** Aug 31, 2017 at 11:49 AM »

Tabor 1624 almost done....20 watts class A pp amp...

parasound · « **Reply #993 on:** Aug 31, 2017 at 12:48 PM »

Very nice Sir Tony.. maraming follower yan Tabor Amp sa diyAudio

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CoolTOYZPH · « **Reply #994 on:** Aug 31, 2017 at 01:48 PM »

What is meant by Class-A PP?

tony · « **Reply #995 on:** Aug 31, 2017 at 02:04 PM »

push pull class A...http://www.circuitstoday.com/push-pull-amplifier

tony · « **Reply #996 on:** Sep 17, 2017 at 09:18 AM »

thanks to Lazada....my dream FTC testing rig comes to life....
inspired by the Cebu group, Fi Do Dido, Kahibulongan Tribes, Juan Dela Cruz III et al.....i made my own FTC testing rig...even has a digital thermometer to monitor ambient temperature...measures power input to amplifier, two ac voltmeters, are now operational, two dc meters with current displays need power supplies, contemplating on whether to use 9 volt battery or an ac powered dc supply...

dana · « **Reply #997 on:** Sep 17, 2017 at 09:24 AM »

nice papaT.
next, pls share/show some measurements you made...

tony · « **Reply #998 on:** Sep 17, 2017 at 09:25 AM »

Quote from: dana on Sep 17, 2017 at 09:24 AM

nice papaT.
next, pls share/show some measurements you made...

will do...

tony · « **Reply #999 on:** Oct 07, 2017 at 02:19 PM »

cooking tubes.....6C33 is such a high trans conductance tube that bias runaway is easily possible so cooking is needed......will connect the grid, cathode and plates together with the one side of the filament and cook some more for a total of 72 hours.....painfully slow progress....

CoolTOYZPH · « **Reply #1000 on:** Oct 07, 2017 at 02:42 PM »

^ Love the low end of these tubes!

tony · « **Reply #1001 on:** Oct 15, 2017 at 07:48 AM »

preamps galore.....from left to right, 4kn8 CCDA, 6SN7/6RHH8 Impasse wamabe, 7N7 version of the Impasse wanabe, and 6AN8 triode pentode line amp.....
two in the middle have balanced outputs...can be used to bridge solid state amps...

tony · « **Reply #1002 on:** Dec 03, 2017 at 07:00 AM »

2017 Dusit show set up... a Baron LU8 pp amp.....someone say that TV tubes ought to have a baron antenna, so i name this tv tube amp Baron LU8 in honor of ka ernie baron, who said, kung walang knowledge, walang power ......

the Tabor clone is not yet ready, maybe next year,.....

tony · « **Reply #1003 on:** Dec 03, 2017 at 07:26 AM »

Teta's 2A3 refurbished...since he has 4 other pairs in stock, i am trying to convince him to make another one...it can start once i get the plinths from Larry Roxas...

painted the main filter cap grey, installed new illuminated switch,
fixed the local cap board, replaced the alps control with a new one and installed gold colored knob....then 3mm acrylic plastic bottom plate.....

ndotcom · « **Reply #1004 on:** Dec 07, 2017 at 11:28 AM »

Sir Tony baka may spare D3A pa yung may ari nyan o kaya ay pasabay ako pag magparating sya dito. Umpisahan ko na ulit 2A3 ko by January.

tony · « **Reply #1005 on:** Dec 08, 2017 at 05:55 PM »

Quote from: ndotcom on Dec 07, 2017 at 11:28 AM

Sir Tony baka may spare D3A pa yung may ari nyan o kaya ay pasabay ako pag magparating sya dito. Umpisahan ko na ulit 2A3 ko by January.

i am sure Teta will read this.....

i am building another one in 2018...

tony · « **Reply #1006 on:** Jan 28, 2018 at 07:00 PM »

irons for an upcoming 2A3 build, psu is beefed up to challenge the newer JJ 2A3's...

tony · « **Reply #1007 on:** Jan 30, 2018 at 05:51 AM »

13GB5 pp amp in a Radford25 topology, 6BN11 dual pentode LTP and 6922 input voltage amp....

tony · « **Reply #1008 on:** Jan 30, 2018 at 04:43 PM »

7N7 SY Impasse wannabe, with balanced outputs...

parasound · « **Reply #1009 on:** Jan 30, 2018 at 05:31 PM »

Ang ganda sir, parang naka balot pa ng carbon fiber yung OPT..

Quote from: tony on Jan 30, 2018 at 05:51 AM

13GB5 pp amp in a Radford25 topology, 6BN11 dual pentode LTP and 6922 input voltage amp....

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tony · « **Reply #1010 on:** Jan 30, 2018 at 07:16 PM »

carbon fibers are better looking than paint....but the end bells are powder coated....

for power traffos, carbon fibers are good for heat radiation...

tony · « **Reply #1011 on:** Feb 05, 2018 at 06:26 PM »

6SN7 line amp with tone controls.....now playing....6SL7 used for tone control in a symmetrical feedback type to give smooth tapers at either end of the spectrum..

parasound · « **Reply #1012 on:** Feb 06, 2018 at 07:23 AM »

Congrats to the lucky owner, very nice octal line stage.

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tony · « **Reply #1013 on:** Feb 06, 2018 at 07:41 AM »

another one in the works, for a guy in San Fernando, Pampanga...
6sn7 line stage, with vsps phono stage...this is a full function preamp..

tony · « **Reply #1014 on:** Feb 10, 2018 at 09:09 AM »

4in1 speaker protection boards, designed and layout by Arnel Rabang a pinoy engineer working in the middle east, and boards fabricated by engineer Dandy Menor out of hong kong...

one of the many collaborations of local pinoy into diy...
more collaborations coming...a real boost for the local diy'ers...

kayee · « **Reply #1015 on:** Feb 10, 2018 at 05:43 PM »

sir tony 1 pc is for 2 speaker na use nito...
thanks

tony · « **Reply #1016 on:** Feb 11, 2018 at 07:58 AM »

Quote from: kayee on Feb 10, 2018 at 05:43 PM

sir tony 1 pc is for 2 speaker na use nito...
thanks

yes, i included you in the second batch of group buys..we are 55 boards and counting...

JojoD818 · « **Reply #1017 on:** Feb 11, 2018 at 10:47 AM »

Tony, with C5 being 1000uf I bet it would take quite a longer period of time for the relay to open during switch off/shutdown period.

I suggest a future iteration to include another pnp transistor with emitter at the junction of r10 and r11 and collector to ground. Base drive should be a 10K resistor and a 1uf across ground. Input of this pnp transistor should come from one of the AC supplies of the power transformer, assuming everything is common ground. Once power is cut, this pnp transistor immediately routes the junction of r10/r11 to ground therefore depriving the relay transistors of base voltage asap and turning the relay off.

That should guarantee the relay to open up before any nasty noises from the amp can go through.

Just my two cents.

Cheers

tony · « **Reply #1018 on:** Feb 11, 2018 at 11:44 AM »

you are correct Jojo, i will use around 220ufd in my build, the power off is the thing, relay should open quick on power down....we will know how to tweak when we use this in an actual operation...i will give your feedback to the designer....thanks...i will review your speaker delay board at diyaudio..

btw, Arnel came up with a honey badger iteration with 8 pairs of output trannies, and SOA protection on a daughter board and is optional...we call it, "Musang" amplifier...

JojoD818 · « **Reply #1019 on:** Feb 11, 2018 at 10:08 PM »

yes tony the relay cutoff during power off must be immediate. at 1000uf and even those large relays there will still be enough energy to keep the coils energized. I suggest a 47uf-100uf without any modifications. Ripple won't be a problem anyway as the psu is only there to supply the relay coils. the ones I made for diyAudio are already subject to revision, but they still work well in most applications..

i'm stuck with the Leach amp at the moment, breaking in my MarkAudio drivers. the Honey Badger hasn't seen much action lately. i'd like to try some of those iterations in the future maybe when I get more time.