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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 23 Jan 2010, 04:58 
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Joined: 24 Feb 2009, 03:24
Posts: 562
Location: USA
What a pity!
Ben, what happened. I don't doubt that all wires You connected right!
Did You try this transf before?

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Hi End is back proportional to the number of composite parts!
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, PP 6005 Gen. Ellectric , headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L& E80CC Siemens&Tel-n.
http://azazello-sound.blogspot.com/


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PostPosted: 23 Jan 2010, 09:02 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
No was bad new and all the voltages were right, too, the amp worked great, probably a factory fault. Shit happens. Now still got the transformer frm the GU32 amp, I will cut another hammond and start over.

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Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 23 Jan 2010, 10:22 
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Joined: 24 Feb 2009, 03:24
Posts: 562
Location: USA
Ben! What kind of brand transformer is dead?

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Hi End is back proportional to the number of composite parts!
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, PP 6005 Gen. Ellectric , headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L& E80CC Siemens&Tel-n.
http://azazello-sound.blogspot.com/


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PostPosted: 23 Jan 2010, 10:36 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hi Nikola,

that was a no name brand from the tube store where I buy most my stuff. I am gonna try my little transformer, itg does 400 ma, probably enough. It will heat the filaments, I already tested that.

_________________
Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 23 Jan 2010, 11:52 
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Joined: 28 May 2008, 21:53
Posts: 4580
Location: Winnipeg, CANADA
Hi Ben, can you post a photo of the finished underside. Looking back at the photos, the heatsink on the CCS may be a little on the small side, particularly if you mount it to the underside of the chassis and there is no ventilation. 400mA should be sufficient for the HT.
Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 23 Jan 2010, 13:01 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
No Gio I can't because I ripped everything out the Hammond, the amp is nonexistent right now. Wait, I'll make a picture of the empty case. It was definitely the transformer, I alligator clipped the small toroid transformer into the amp and everything works fine, and this one is lots smaller than the big one. What really pisses me off, is that I really build the two power supply's rather nicely, now with the other transformer I gotta start over new, it has only one secondary and it is really on the small side. Right now I don't know. Gotta go to the hospital this week and have a littl tumor removed for the second time, chances are I won't come back anyay,so why worry about a stupid tube amp. For today I had it, my friends.


Greetigs

_________________
Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 24 Jan 2010, 22:30 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hi guys,

I am not having much luck with my kt88. I only got the output stage of the left channel hooked up, but it conducts way too much current and my 2 100 ohm resistors smoke. Everything is hooked up right. If I disconnect the LM317, no current flows, no smoking resistors either. I exchanged the LM317, didn't do the trick, changed the resistor to 8,2 ohm, still smoking 100 ohm resistors. If you look at the picture, it is nothing hooked up what can cause that. Maybe my brand KT88 don't work with this schematic at all? The output stage seems to work, I get hum to the speakers, just not long untill the resistors smoke. Please help.

_________________
Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 24 Jan 2010, 22:40 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
The kt88 get very hot within seconds and conduct way too much current, I don't know why? Please help

_________________
Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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 Profile  
 
PostPosted: 24 Jan 2010, 22:48 
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Joined: 13 Jul 2009, 20:01
Posts: 92
Location: Space Coast Florida
Bennybuis wrote:
The kt88 get very hot within seconds and conduct way too much current, I don't know why? Please help

Recheck the wiring to make sure there are no errors.

Do you have a second pair of KT88s that you can try?


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PostPosted: 24 Jan 2010, 23:08 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hi guys, if you look at the picture, only pin 3 and 4 (plate and grid 2) the 220 ohm resistor on pin 5 and the lm 317 are installed, so only the left output stage is hooked up and it conducts way too much current and the tubes get hot and the two 100 ohm resistors blow. I really can't find nothing wrong with it. Please help.


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_________________
Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


Top
 Profile  
 
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