Anyone build an Orange?

[rp]

I looked and i think TC's are out of production. Maybe it's the FC or TS series now.

http://www.partsconnexion.com/capacitor ... on_kx.html
http://www.digikey.com/product-detail/e ... -ND/483396

These show up at Mouser too.

I worked in A/V and I couldn't get a flat-screen either, the margins on those things is so small that trying to get one from my old employers through distribution was hardly less than from J&R.

[eddie25]

The reason I'd go with a more conventional (Ken Fischer TW) type power supply is cost. 100uF 450 volt caps are $25 bucks each which is way out of this "cheap yankee" price range. I was thinking something more along the lines of the express supply which I can manage $$ wise.

you can get F+T's for about $9 each at AES or Tube Depot, or go for 350V which will be fine in the series setup and a bit cheaper.

[Smokebreak]

Here's that Orange catalog from '73. 49 lb. head!http://forum.orangeamps.com/viewtopic.php?t=4674

[JoeCon]

Smoke,

Awesome catalog...

So what OT for just a pair of EL34's??
Looks like Weber has a nice PT for this build with multiple voltages and a bias tap too. Any problems with their PTs'??

[Gaz]

FWIW, the Orange OR series amps used the same OT for the 2x and 4xEL34 models, and just switched the secondary taps. This technically reduces the bandwidth on the lower power model, but I don't think anyone noticed

[renshen1957]

Will modern El34's handle that 500Volts??!! Or do I have to start saving for Mullards now...
To my daughters, "no college for you girls, I need Mullards!" LOL...

Hi JoeCon,

Try either JJ KT 77 or the Ruskie KT 77 either is a more rugged tube among the modern production. Or your could break for Psvane EL34PH at only $699 per quad.

NOS RFT (sometimes sold under the Siemens label sometimes not) the dimple Top EL34 takes the voltage from personal experience.

Best regards,

Steve

[Gaz]

I don't agree about the KT77s, well at least the JJs. I've had more problems with that tube than any other. I think the Ruby branded "high voltage" EL34BHTs would be best for el34s. I know Leo Gnardo has had good luck with them too.

Actually for higher screen voltages I think modern 6L6s are probably more robust just due to the fact they draw less screen current and don't have the same problems with mis-aligned screen grids. FWIW. Soldano's use high voltages and use the Sovtek "5881" which is actually a Russian 6l6 variant.

[Smokebreak]

Smoke,

Awesome catalog...

So what OT for just a pair of EL34's??
Looks like Weber has a nice PT for this build with multiple voltages and a bias tap too. Any problems with their PTs'??

Hey Joe, glad you liked the catalog. i was enamored by it when I did my orange and it help set the mood for the build

Weber has a "stock" PT for their 50w and 100w kits, and they both have dual voltage taps for HT. They have 2 OT options for each, a "High" and "Low" headroom option. I have used the 50w PT and low headroom OT in a Plexi, and the 100w PT and low headroom OT in my OD120. They both came out great. I've had a myriad of other problems with Weber, but not with the actual transformers, which I believe they have made in China FWIW to ya.

Classictone(Mag Comp) is a brand I find myself going back to more than all the others. They have some "project styles" that I imagine would work great in a 50W Orange . Check out:

http://www.classictone.net/40-18095.html --very similar voltages to Weber's, and dual-tap, but 150mA vs 200mA
..and ..

http://www.classictone.net/ClassicTone- ... rmers.html

Here's a link to some info about the 100W project trannies : http://forum.metroamp.com/viewtopic.php ... 2&start=45

I imagine any of the 45 to 60W OTs would work for you....3.7K or 4.2K the choice is yours... I believe most of these are made in Chicago.

Have fun![/url]

[Smokebreak]

Smoke,

Awesome catalog...

So what OT for just a pair of EL34's??
Looks like Weber has a nice PT for this build with multiple voltages and a bias tap too. Any problems with their PTs'??

Hey Joe, glad you liked the catalog. i was enamored by it when I did my orange and it help set the mood for the build

Weber has a "stock" PT for their 50w and 100w kits, and they both have dual voltage taps for HT. They have 2 OT options for each, a "High" and "Low" headroom option. I have used the 50w PT and low headroom OT in a Plexi, and the 100w PT and low headroom OT in my OD120. They both came out great. I've had a myriad of other problems with Weber, but not with the actual transformers, which I believe they have made in China FWIW to ya.

Classictone(Mag Comp) is a brand I find myself going back to more than all the others. They have some "project styles" that I imagine would work great in a 50W Orange . Check out:

http://www.classictone.net/40-18095.html --very similar voltages to Weber's, and dual-tap, but 150mA vs 200mA
..and ..

http://www.classictone.net/ClassicTone- ... rmers.html

Here's a link to some info about the 100W project trannies : http://forum.metroamp.com/viewtopic.php ... 2&start=45

I imagine any of the 45 to 60W OTs would work for you....3.7K or 4.2K the choice is yours... I believe most of these are made in Chicago.

Have fun![/url]

[rp]

I would think you want something Partridge-like, Edcor has ~3.5K Ot that could work well here as they are hifi-ish and broadband and well made, and a bargain to boot.

Here's some other options but the shipping would make the Edcors or MCs a better deal. I know nothing about these, if actually good/accurate/reliable...

http://www.inmadout.com/

but they're reasonable. reseller here:

http://www.uraltone.com/elektroniikan-k ... dr504.html

you can set that site to english (upper right).

Welter (germany) I think makes a Hiwatt Partridge clone OT too.

as for tubes you can hunt down ANOS Phillips/GE 6CA7s too, singles can be cheap, not so Brit sounding but still fun. They don't really have to be matched you know, no one matched them in the glory days. Before Groove tubes, you just plugged tubes in, turned down the lights, if no red plating, you were good to go. Most people didn't even do the dark room thing, if it smoked on stage, then you were out a $100 you could have blown on coke

[JoeCon]

rp,smoke

I've used the Edcor before and I liked them. See a 50Watt 3.4K into 8 ohms that ought to work.

Still gotta go with a pair of EL34's, with christmas on the horizon I'll ask the family to pitch in and get some Mullards!! "I just want two gifts..a pair of Mullards"!! Could work....

Thanks...

[vibratoking]

"I just want two gifts..a pair of Mullards"!!

Think big...you need at least two matched quads to start with. Ya never know what Santa will bring until you ask. A single pair of Mullards and you'll be moving them from amp to amp, rebiasing like crazy, and running your 100wattters at 50 wondering what it would sound like with the full complement.

[renshen1957]

I don't agree about the KT77s, well at least the JJs. I've had more problems with that tube than any other. I think the Ruby branded "high voltage" EL34BHTs would be best for el34s. I know Leo Gnardo has had good luck with them too.

Actually for higher screen voltages I think modern 6L6s are probably more robust just due to the fact they draw less screen current and don't have the same problems with mis-aligned screen grids. FWIW. Soldano's use high voltages and use the Sovtek "5881" which is actually a Russian 6l6 variant.

Hi Gaz,

I have the exact opposite experience with the JJ KT77, these were the go tubes for a friends Matchless amp that was eating through NOS EL34 as though they were candy.

However, like any tube, the are good and bad lots of tubes that pass through QC.

I don't have stock in JJ but have had good luck with EL34L but again for musicians that want more headroom/later breakup. The 6CA7 weren't bad either but weren't the same as NOS I had before, but for those with bad experiences, the Ruskies make some great tubes, EH makes 6CA7. But even the Russians had their share bad batches.

There was a time in the 1990's that the 5581 Sovteks (which are more like 6L6GC for ratings) were the only reliable tubes.

Kevin O'Conner of London Power said he switched to these tubes as the failure (at that time) was 1% when it was 1 tube out 4 for Russian EL34s on a good day and significantly higher (50-75%) on bad days.

I prefer the SED (winged C) EL34, never had trouble but now the company is defunct, so when the stocks at CEdist and others are exhausted that's about it. Then it will be either a New Sensor or Shuguang choice (if one eliminates JJ).

No one mentioned the 6550 tube or the KT88 both should be able to handle the higher volts. But alas the tone would be different and the heater current demands higher.

Best regards,

Steve,

PS If it were I, I would investigate the KT66 from Shuguang/Valve Art/Ruby or the Gold Lions, if your Xformer has the current.
Steve

[JoeCon]

Vibking

I need a new roof and house painting before I get 2 quads of Mullards! LOL!
Plus so far I only build two power tube amps a Rocket with 2 EL84s and a Rockster with 2 KT66. So a pair of Mullards for an Orange type amp will work for me. In the past I had 100 watt Marshalls and even an early 70s Hiwatt 100. Pretty sure those things gave me the ringing ears I have today.

But I would like to try a 6V6 Plexi soon...

[rp]

I've used the Edcor before and I liked them. See a 50Watt 3.4K into 8 ohms that ought to work.

Look more deep into their site. IIRC they have a 3.5K 4/8/16. I would'nt build any amp even a combo with just one tap.