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Old 12th June 2010, 08:55 AM   #91
Junior is offline Junior  Singapore
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Quote:
Originally Posted by tigrine View Post
Nikon1975 and Junior what do you have for the ouput transformer 3.5k, 5k?
What is the B+? 450 volts and the resistor for the bias ? 560k 720k?
hi tigrine,

Opt Tx = 1629SE (6.5k)

Configure to accept both KT88 or EL34 with Cathode Bias Resistor at 560ohm and 820ohm respectively.

Picture show EL34.
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Old 12th June 2010, 02:34 PM   #92
tigrine is offline tigrine  Canada
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Hi Junior,
Do you use a switch to select between the two resistors?
If so, do you have photos to show it?

I have two SimpleSE. One with EL34 and the other with KT88.
I hesitate to bring together all under the same amplifier
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Old 12th June 2010, 10:58 PM   #93
Junior is offline Junior  Singapore
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Quote:
Originally Posted by tigrine View Post
Hi Junior,
Do you use a switch to select between the two resistors?
If so, do you have photos to show it?

I have two SimpleSE. One with EL34 and the other with KT88.
I hesitate to bring together all under the same amplifier
yes i switch between 2 resistors via a DPDT switch.
this is just one of the many ways of implementing.

the actual built picture was rather "messy" thus i had also come out with a graphical representation and hope it helps.

Click the image to open in full size.
Click the image to open in full size.
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Old 13th June 2010, 01:56 PM   #94
tigrine is offline tigrine  Canada
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Tanks Junior for the information
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Old 14th June 2010, 01:39 AM   #95
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I have a 560 with a 2K resistor in parallel with a switch.

D.
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Old 10th July 2010, 01:15 AM   #96
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Default My Simple PP

This has been a very rewarding project, This amp fired up with any problems and sounds great. It has very good bass too. Thanks you guys for answering all my questions. Sovtek el84m,12at7wc jan philips and a vintage telefunken gz34.
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Old 10th July 2010, 01:30 AM   #97
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Moparman. Looks cool. Still planning on going to the Nationals? I think I might make it this year, probably Saturday. Missed the last two. I went several years in a row before that. It is 1200 miles away, but I have to visit my mother in law who lives in West Virginia about 100 miles east of the track. If you are going, PM me your cell phone # if you want to talk cars, amps, or whatever. My boss could still veto the time off though.
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Old 31st July 2010, 09:27 PM   #98
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Default My SimpleSE

My first tube amp, and though it cost more than anticipated -- what diy project doesn't -- I think it's worth every $.01. Beautiful sound, makes my full range Fostex sing

Pretty standard build, Edcor XPWR035, XPSE25-8-5K, Hammond 193J, 70uF motor run cap, .22uf Auricaps, EH-EL34, JJ-GZ34, Jan-Philips 12AT7WC.
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Old 1st August 2010, 12:59 AM   #99
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Quote:
Pretty standard build
Except for that totally cool wooden knob!
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Old 1st August 2010, 01:46 AM   #100
doorman is offline doorman  Canada
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Quote:
Originally Posted by fandersen View Post
My first tube amp, and though it cost more than anticipated -- what diy project doesn't -- I think it's worth every $.01. Beautiful sound, makes my full range Fostex sing

Pretty standard build, Edcor XPWR035, XPSE25-8-5K, Hammond 193J, 70uF motor run cap, .22uf Auricaps, EH-EL34, JJ-GZ34, Jan-Philips 12AT7WC.
Very nice indeed!
Which speakers are you using?
Don
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