Author Topic: My Tube Journey (Read 210284 times)

tony · « **Reply #390 on:** Jun 29, 2015 at 12:56 PM »

Quote from: camoteque on Jun 29, 2015 at 12:36 PM

Maganda Tony. I have 2 more 2A3 SE amps and this 4p1L amp is in the same league if not better. Very transparent sounding. The amp is currently connected to my midhorns taking care of 600hz to 4.5khz duties.

Larry, good to know and considering the cost of tubes, panalo.....
a guy from the states was asking me for schematics, gave him one...
he will surely like it as well...
on a general note, when any amp is asked to reproduce in a limited range of frequencies,
that is when its life is easiest....

tetablanco · « **Reply #391 on:** Jun 29, 2015 at 01:17 PM »

Quote from: tony on Jun 29, 2015 at 06:37 AM

the pleasure is mine sir.....now you have two controls to play around with.....

What tubes are on the preamp? My tube education continues unabated.

tony · « **Reply #392 on:** Jun 29, 2015 at 01:23 PM »

Quote from: tetablanco on Jun 29, 2015 at 01:17 PM

What tubes are on the preamp? My tube education continues unabated.

12SN7 and 80ST tube rectifier....sorry about the big pics...

tetablanco · « **Reply #393 on:** Jun 29, 2015 at 03:40 PM »

Quote from: tony on Jun 29, 2015 at 01:23 PM

12SN7 and 80ST tube rectifier....sorry about the big pics...

Thanks!

tony · « **Reply #394 on:** Jun 29, 2015 at 07:48 PM »

Quote from: tetablanco on Jun 29, 2015 at 03:40 PM

Thanks!

thanks also, got it na...

dana · « **Reply #395 on:** Jun 30, 2015 at 09:21 AM »

Quote from: tony on May 29, 2015 at 08:30 AM

Tuesday, May 23 mini eyeball with kabalen's at Angeles City, Pampangga....
we are the audio techies having a mini EB testing power amps as per FTC: watts rms, 1khz, 8ohms dummy load....
Norman Santos is one OFW working in Dubai, who spends his spare time laying out boards,
he is one of the many OFW's spending their time in a very productive way....
you will be delighted to find out that our local techies are now designing ang making their own smps psu's...
the Pinoy talent are all over the earth....
our Pinoy engineers in China produces many consumer electronics products,
i wll not be surprised if your DAC which came from china has the hand of a Pinoy techie
at one point or another...

left to right, Larry Roxas, Wewe Padilla, Tony Tecson, Jun Mabanta, Kiko Jimenez, Norman Santos, Jun del Mundo

really feels good to be among peers.....

just saw this now.
may reunion palang nangyari jan sa angeles papaT.
complete lab bench testing yata ginawa nyo jan....
ang titikas ng mga audio techies...
thanks papaT.jan pala si tukkar, naka pm ko na sa elab early this wk...have to check my vfets ranking code.

tony · « **Reply #396 on:** Jun 30, 2015 at 09:57 AM »

Quote from: dana on Jun 30, 2015 at 09:21 AM

just saw this now.
may reunion palang nangyari jan sa angeles papaT.
complete lab bench testing yata ginawa nyo jan....
ang titikas ng mga audio techies...
thanks papaT.jan pala si tukkar, naka pm ko na sa elab early this wk...have to check my vfets ranking code.

Don, maraming pang matitikas na pinoy techies na taga Cebu at Mindanao,
nasa facebook silang lahat....https://www.facebook.com/groups/301399146708263/
https://www.facebook.com/groups/APEETG/ at https://www.facebook.com/groups/1507333286196797/
Si Norman isang OFW na based sa Dubai...yearly ang vacation nya...
si Tukkar, aka Jun Mabanta, ay isang field engineer ng Xerox copiers based in San Fernando...
i am happy i was able to get them together in a mini EB FTC testing power amps...
marami pang ibang OFW's na nakakapag lay-out ng boards, nakaka-design ng amplifiers
at ngayon nga ng mga SMPS power supplies....
malayo na ang narating ng mga pinoy techies natin...
i am proud that in one way or another i am able to give them directions
although these guys pretty know what they are doing already...
kung tutuusin hindi natin kailangan ang China para sa mga amps,
kaya nating magproduce ng pinoy made....

edrel sison · « **Reply #397 on:** Jun 30, 2015 at 06:12 PM »

TV tubes are coming.....

tony · « **Reply #398 on:** Jun 30, 2015 at 07:18 PM »

Quote from: edrel sison on Jun 30, 2015 at 06:12 PM

TV tubes are coming.....

Edrel, that's always a great news...

tony · « **Reply #399 on:** Jul 02, 2015 at 08:41 PM »

intermission.....Danny 40W power amp....designed by Danny Eulogio (based in Seattle, Washington) and PCB lay-out by Eng'r. Dandy Menor from Baguio City....

got the chassis powder coated.....

modified the speaker protector delay to >10 secs.....

tony · « **Reply #400 on:** Jul 03, 2015 at 12:14 PM »

^^btw, this is the original thread at elab......http://www.elab.ph/forum/index.php?topic=42590.0

tony · « **Reply #401 on:** Jul 05, 2015 at 12:19 PM »

another single ended amp in the works...
using the 4D32 beam tetrodes...
contemplating enhanced triode mode...
tubes came from Gerry Sta Maria for 1500 each...
got another 10 tubes when they were put on sale at Surplus Sales of Nebraska...
winding the power traffo, with about 500VA capacity for an aoutput of about 15 watts per channel
these tube will give the KT150 a run for the money, rated at about the same power,
the 4D32 has a bigger cathode, filaments running 6.3 volts and 3.8 amperes...
http://www.r-type.org/exhib/aai0005.htm

edrel sison · « **Reply #402 on:** Jul 08, 2015 at 02:01 PM »

Quote from: tony on Jun 30, 2015 at 07:18 PM

Edrel, that's always a great news...

unfortunately the weather disturbance continues and so I cannot schedule the meet..
large boxes, tinaas ko na at baka mabasa pa!

tony · « **Reply #403 on:** Jul 08, 2015 at 04:16 PM »

Quote from: edrel sison on Jul 08, 2015 at 02:01 PM

unfortunately the weather disturbance continues and so I cannot schedule the meet..
large boxes, tinaas ko na at baka mabasa pa!

thanks Edrel, we can do this when the weather improves...

edrel sison · « **Reply #404 on:** Jul 08, 2015 at 04:22 PM »

Tony what can you make of a 12GT5? Got 2 pcs of them. Your stash also got 2. Cheap on ebay. Promising tube or not?

tony · « **Reply #405 on:** Jul 08, 2015 at 04:29 PM »

Quote from: edrel sison on Jul 08, 2015 at 04:22 PM

Tony what can you make of a 12GT5? Got 2 pcs of them. Your stash also got 2. Cheap on ebay. Promising tube or not?

along the lines of the 6AV5, the 9pin socket can be tricky though....
you can keep the other two, i have plenty of power tubes already..
i know what you are thinking...single ended, so i suggest you parallel them
two per side, so that you will have more ooomph to drive speakers...

tony · « **Reply #406 on:** Jul 08, 2015 at 04:36 PM »

if you notice i haven't done any amp using the novar types,
the Chinese seems to have both the magnaoval and the novar under the same class...
i have the 13gb5, pl504's, the 6lq6 etc tubes waiting to see action...
12 pin compactron sockets are no problem....

edrel sison · « **Reply #407 on:** Jul 08, 2015 at 04:37 PM »

you will be surprised at the number of power tubes on your stash, complete with boxes. I have just bought them B9D sockets so that I could try them soon..

tony · « **Reply #408 on:** Jul 09, 2015 at 07:54 AM »

^^i remembered that you built an 807 SET, so the 12gt5 will sound almost the same...

re-posting compilation by smoking-amp:

Don, aka smoking-amp, updates his list of power tubes, i have the "audio power tubes" emboldened,
as you can see those tubes would be in the bottom of the hierarchy of tubes based on cathode
capability (transconductance).....
so can you blame me for hoarding tv scanning tubes?

:lol:

Quote

smoking-amp update,more complete:

List of knee currents for g2 = 150 V, g1 = 0 V, Vp = 60 to 80 V
<tube> <Watts> <mA knee@150Vg2> <gm> <Mu> <maxDCmA> <registered by> <date>

6LF6 40W 1144mA@150V 15K@125mA Mu3 500mADC Amperex 1968
6KG6/EL509 34W 1135mA@150V 13K@150mA Mu3.2 500mADC Amperex 1965
6MC6 33W 1130mA@150V 14K@125mA Mu4 400mADC RCA (6LX6 clone) 1972
13E1 90W(absmax) 1120mA@150V 35K@500mA Mu4.5 800mADC AEI 1961
6MH6 38.3W 1100mA@150V 14K@125mA Mu4 500mADC GE (up-rated 6LX6,6KD6,26HU5) 1972
6MB6 38W 1085mA@150V 14K@110mA Mu3.5 400mADC Sylvania 1971
6LR6 30W 1085mA@150V 16K@140mA Mu3.5 375mADC Sylvania 1968
6LX6/6KD6/26HU5 33W 1080mA@150V 14K@125mA Mu4 400mADC GE 1969/1965/1969
6LW6 40W 1050mA@150V 12K@125mA Mu3.7 400mADC GE 1971
6KN6 30W 1050mA@150V 16K@100mA Mu4.5 400mADC Sylvania 1965 (later versions are 6KD6)
6LZ6 30W 940mA@150V 11K@140mA Mu3 350mADC RCA 1971
6LB6/A 30W/35W 825mA@150V 13.4K@105mA Mu4 315mADC GE 1967
6JE6C/6JS6C 30W 789mA@150V 10.5K@130mA Mu3 350mADC Sylvania 68/69
6JE6 24W 762mA@150V 9.6K@115mA Mu3 315mADC RCA 1962
6JS6/6HF5 28W 749mA@150V 11.5K@130mA Mu3 315mADC GE 1964/1963
6MJ6 30W 740mA@150V 11K@100mA Mu3.6 350mADC RCA 1973
6LG6 28W 740mA@150V 11.5K@90mA Mu3.6 315mADC GE 1967
6LQ6 30W 715mA@150V 7.5K@95mA Mu3 350mADC RCA 1967
6ME6 30W 700mA@150V 9.6@130mA Mu3.5 350mADC RCA 1971
6DQ5 24W 690mA@150V 10.5K@110mA Mu3.3 315mADC RCA 1957
6JF6/6JG6 17W 660mA@150V 10K@80mA Mu4.1 275mADC RCA 1965/1964
6KM6 20W 630mA@150V 9.5K@80mA Mu4 275mADC RCA 1965
6HD5/6HJ5 24W 630mA@150V 10K@80mA Mu4.2 280mADC Raytheon 1962/1963
6JR6/6JU6 17W 600mA@150V 7K@45mA Mu4.7 275mADC RCA 1968/1966
6JZ6/21HB5A 18W 560mA@150V 9K@46mA Mu4.8 230mADC GE 1966/1964
12HE7 10-15W 540mA@150V 8.8K@60mA Mu4.2 200mADC GE (15W if damper disabled) 1964
6CL5 25W 514mA@150V 6.5K@90mA Mu3 240mADC Sylvania 1955
6GB5/29KQ6/EL500 17W 500mA@150V 13K@100mA Mu5.1 275mADC Amperex 1961/Matsucrapa 1959/Philips 1961?
6KV6/A 20-28W 488/610mA@150V 6K@40mA Mu4 275mADC RCA (re-rated 6KM6?) 1967/1969
6HB5/6GY5/21JV6/6KE6/16KA6 18W 475mA@150V 9.1K@50mA Mu4.7 230mADC GE/GE/GE/Ray/Tung 1962/1962/1965/1965/1964
6EX6 22W 460mA@150V 7.7K@67mA Mu4.2 220mADC Raytheon (up-rated 6CD6) 1959
6CB5/A 23W 440mA@150V 8.8K@90mA Mu3.8 240mADC RCA 1954/1956
6CD6/GA 15/20W 422mA@150V 7.7K@75mA Mu3.9 200mADC RCA/GE 1949/1954
6GT5/6GJ5/6JT6/6JB6/6GW6 17.5W 380mA@150V 7.1K@70mA Mu4.4 175mADC RCA 1961/1961/1964/1962/1961
6GE5 17.5W 350mA@150V 7.3K@65mA Mu4.4 175mADC GE 1961
6GF5 9W 345mA@150V 4.7K@34mA Mu4.2 160mADC GE 1961
6JM6/6JN6/6FW5/6GC6 17.5W 340mA@150V 7.3K@70mA Mu4.4 175mADC GE 1964/1964/1960/1960
6DQ6B/6GV5 17.5W/18W 330mA@150V 7.3K@65mA Mu4.4 175mADC GE 1959/1962
6DQ6/A 18W 280mA@150V 6.6K@55mA Mu4.1 120/155mADC CBS/RCA 1955/1956
6JA5/10JA5 19W 276mA@150V 10.3K@95mA Mu5.5 110mADC GE 1971
6LU8/6LR8//6MY8 14//16W 265mA@150V 9.3K@56mA Mu6.5 75mADC Sylvania 1964/1964//1970(Toshiba)
6AV5/GA///6BQ6/GA 11W 255ma@150V 5.9K@57mA Mu4.3 110mADC CBS/GE 1949/1955 /// CBS/Syl 1949/1953
KT120 60W 221ma@150V 190mADC
KT90 50W 220mA@150V
6Y6G/GT/GA 12.5W 200mA@150V Ray 1937/KenRad 1939/Syl 1954
6550A 35W/42W 190mA@150V 11K@140mA 190mADC
6W6GT 10W 185mA@150V 8K@46mA Mu6.2 65mADC CBS 1939
KT88 35W 170mA@150V 175mADC
6CA7/EL34 25W 107mA@150V 11K@100mA Mu10.5 150mADC Philips 1952
6JC5 19W 80mA@150V 4.1K@43mA Mu7 75mADC Sylvania 1971
6L6/G/GA/GB/GC 30W 77mA@150V 4.7K@40mA Mu8 110mADC RCA 1936/Ray 1936/Syl 1943/Syl 1954/GE 1958
6HB6 10W 70mA@150V 20K@40mA Mu33 60mADC Raytheon 1961
6GK6 13.2W 65mA@150V 11.3K@48mA Mu19 65mADC CBS 1959
6BQ5/EL84 12W 65mA@150V 11.3K@48mA Mu19.5 65mADC Rogers 1956
6V6G/GT 14W 45mA@150V 4.1K@45mA Mu9.8 40mADC KenRad 1936/CBS 1939

tony · « **Reply #409 on:** Jul 09, 2015 at 07:59 AM »

when i look at a power tube, i look at its cathode and its transconductance...

tony · « **Reply #410 on:** Jul 09, 2015 at 11:02 AM »

taking my sweet time...output offset adjustments confirmed working,
output bias set to about 50mA per collector...
i set the 2k bias pot to 1k and i was at the target current, no further adjustment needed,
whe you maximise to 2k, the output stage is deep in cut-off at power up and power meter
reads12 watts, now my power meter reads 17 watts, meaning the output stage are
now dissipating an additional of 5 watts, things are cool to touch after a few hours...
after two hours meter reads 16 watts for just 1 watt per output trannie,
and the good news is, bias is not increasing....

rochie · « **Reply #411 on:** Jul 10, 2015 at 12:13 AM »

Quote from: tony on Jul 09, 2015 at 11:02 AM

taking my sweet time...output offset adjustments confirmed working,
output bias set to about 50mA per collector...
i set the 2k bias pot to 1k and i was at the target current, no further adjustment needed,
whe you maximise to 2k, the output stage is deep in cut-off at power up and power meter
reads12 watts, now my power meter reads 17 watts, meaning the output stage are
now dissipating an additional of 5 watts, things are cool to touch after a few hours...
after two hours meter reads 16 watts for just 1 watt per output trannie,
and the good news is, bias is not increasing....

sweeettttttt

tony · « **Reply #412 on:** Jul 15, 2015 at 04:36 PM »

over a thousand tubes, all in individual boxes...
now undergoing inventory.....

CoolTOYZPH · « **Reply #413 on:** Jul 15, 2015 at 05:45 PM »

WOW! WOW! WOW!

Quote from: tony on Jul 15, 2015 at 04:36 PM

over a thousand tubes, all in individual boxes...
now undergoing inventory.....

Superman · « **Reply #414 on:** Jul 15, 2015 at 09:57 PM »

remington · « **Reply #415 on:** Jul 15, 2015 at 10:42 PM »

gold mine ni master tony!!!

tony · « **Reply #416 on:** Jul 17, 2015 at 09:17 AM »

Quote from: remington on Jul 15, 2015 at 10:42 PM

gold mine ni master tony!!!

indeed....i found a solitary 6LW6, the king of TV horizontal tubes, i know where to get them,
i am tryng to convince the store to sell me a sleeve of those tubes...

one such amplifier using the tube...
http://www.tiffe.de/roehren/ga399ma.pdf

above article explains why this tv tube is better than traditional audio beam tetrodes/pentodes...

been thru over 200 power tubes, some of which sells northwards of U$50 n the states today..
the U$1 tubes i purchased years ago are now selling for more than U$4 nowadays...
it seems that as soon as a tv tube is discussed at diyaudio.com, the chinese will gobble
them up in the tens of thousands....

rochie · « **Reply #417 on:** Jul 18, 2015 at 07:36 AM »

Quote from: tony on Jul 15, 2015 at 04:36 PM

over a thousand tubes, all in individual boxes...
now undergoing inventory.....

wow dami nyan sir tony,sarap makihalukay for a preamp project hehehe

tony · « **Reply #418 on:** Jul 19, 2015 at 01:42 PM »

Quote from: rochie on Jul 18, 2015 at 07:36 AM

wow dami nyan sir tony,sarap makihalukay for a preamp project hehehe

i found a pair of 7au7's...these can easily sub for a 6cg7 or 6gu7
without changing anything on the circuit...
found also 6dt8's and 12dt8's, these can be used on circuits using the 12at7...
and many more....like a pair of 8bq5's, a lots of 10bq5's, don't let the filament voltage
turn you off, a power traffo can be made to use 10 or 8 or the regular 6bq5's....
i am having lot's of fun sorting the tubes out....
these lot brings my tube stash to over 3000 pcs...
the 6JH8's can be used to make a one tube stereo line amp, volume control is a single pot....

rochie · « **Reply #419 on:** Jul 19, 2015 at 01:51 PM »

Quote from: tony on Jul 19, 2015 at 01:42 PM

i found a pair of 7au7's...these can easily sub for a 6cg7 or 6gu7
without changing anything on the circuit...
found also 6dt8's and 12dt8's, these can be used on circuits using the 12at7...
and many more....like a pair of 8bq5's, a lots of 10bq5's, don't let the filament voltage
turn you off, a power traffo can be made to use 10 or 8 or the regular 6bq5's....
i am having lot's of fun sorting the tubes out....
these lot brings my tube stash to over 3000 pcs...
the 6JH8's can be used to make a one tube stereo line amp, volume control is a single pot....

i think i have a spare traffo here the one that i got from you previously,ill check the secondary voltage