Photo Gallery

[mhouston]

Thanks guys!
The KT88 was triode but now I'n Ultralinear, like them in both mode

On my Pentode SE amps with the UL tap on the OPT I add a triode/pentode switch. Nothing too techo just switches from the UL tap to 100ohm resistor to the plate. SE Pentodes have a good balance of lower-mid weight and detail. Currently I'm using JJ Blue glass KT88's.

 

[tim614]

Yeah. I thought about the switch but just got too lazy and I like UL mode allitle bit better.

 

[mhouston]

Originly where the triode/pentode switch is now was a volume control. But at 3/4 settinmg it buzzed. So it got the axe and the triode switch dropped straight in. They easy to retro-fit later. I run 0NF but another switch to drop in is one which may switch in a little local feed back. Easy and cheap to do.

 

[tim614]

That buzz you talking about I have experience the same, I found out that if you connect the safety ground I'n series with 100-200 ohms and cap I'n parrelle with the resister to chassis ground the buzz was gone, I don't know if you've try that or not but it work for me

 

[mhouston]

I have used that techique in the past but in this case I ripped the ofending part and put something usefull in the hole.

 

[tim614]

Simple enough!
I like that.

 

[mhouston]

Strange we were talking about my SE KT88 Pentode/Triode amp but I took it to a friend's house and came home with a cheque. With the amp in triode mode the purchase's veteran Tannoy 10" speakers really lifted. We tried the amp ( with JJ Blue Glass KT88s) in pentode mode-no go. I then inserted my Siemens NOS EL34 (expensive) tubes in both Pentode and Triode-awful.

So the day was won with KT88s in triode mode.

 

[gaborbela]

KT88SE

Hello
I would like to ask some question from tube expert guys..
Do the half tube can drive the KT88??
Please take a look at the schematic.
Greetings Gabor

 

[tomchr]

Hello
I would like to ask some question from tube expert guys..
Do the half tube can drive the KT88??

Rather than asking in the Picture Gallery thread, I suspect you'll get more answers if you start a new thread.

~Tom

 

[gaborbela]

For a "simple " answer I do not want to start a new tread!
I see people here talk about many another think , not just ready made projects or pictures.
Sorry if it look like I want to hijack the tread!
Please accept my humble apology.
Greetings gabor

 

[Cassiel]

Yes it can, some would say not ideally. To know different and varied opinions: start a new thread.

 

[mhouston]

My latest creation. Class A, 3W per channel, single ended. Can be easily changed to pentode mode. I made this one for sale, but still not sold More info here: Forums - SE84C+ Review Tone Audio Magazine

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Some how I missed this. Very, very nice. Top layout. Very cool. I like big time. Don't stop.

 

[mindutis]

Well yeah, a bit late, but its ok Thanks. A new one is on its way, but not tube this time...

 

[Cassiel]

Wood looks great. I'm thinking it would be fun trying to land a toy chopper on it. I'd also like to see a woman putting those tube dampers. Sexy.

 

[Cassiel]

Forgot to ask, do you hear any difference with the dampers on/off? Also, do they last a long time? Made out of rubber I think they may lose position and with time go down - due to heat.

 

[mindutis]

The helicopter landing zone is taken by a flower pot

I'd also like to see a woman putting those tube dampers. Sexy.

Oh my gosh, i am sorry for the picture that comes to your mind when you look at the photos i uploaded

I wanted to try the ordinary O-rings. It works on the smallest lamp, because it heats up less than the bigger ones. On a bigger ones they just begin to melt. So i removed them. There is a possibility to order O-rings made of silicon or so, but the quantities at the factories are high. So no sound difference with those in a photos. I just don't have newer photos without it.

 

[Cassiel]

Thanks for the reply. Good to know you have a sense of humor. Oh, and great work! I can't (I have tried) make the wood look that good.

 

[TubeManiac]

still under construction... but its almost done

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An externally hosted image should be here but it was not working when we last tested it.

 

[Cassiel]

Nice, I like slim amps. Best antidote against boutique caps. This guy has the world record for a tube amp.

 

[mhouston]

Tubemaniac: Lovely build.

Previously I just posted the amp section of a 300B I am building for some one else. It uses the JJ Full Music 300B/SE tubes. The PS, here, is assembled but not wired. The cap on top is the Mundorf tube caps.