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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

First Project with these tubes
First Project with these tubes
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Old 15th April 2012, 09:47 PM   #1
rwilson411 is offline rwilson411  New Zealand
diyAudio Member
Join Date: Apr 2012
Location: Auckland
Default First Project with these tubes

Hey all, im totally new to Tube Circuits.

I have the fortune of having many NOS Valves, some of which include:
  • ECL82 Sylvania
  • CRC 6V6GT/G
  • EL84 Zaerix
  • CV378 / CV717 / CV8458
  • 6AU6 (EF94)
  • CV574 / CV2901 / E795
  • ECC88 Mullard
  • CV404 Chelmer
  • CV1833 Heintz and Kaufman
  • CV452 AD
  • CV1377 Chelmer
  • E82CC Rohre Siemens
  • E180CC Mullard
  • 6V6GT Brimar
I have no Power and Output Transformers.

Im looking for a detailed project showing all connections to build a nice amplifier with some of these tubes.

Im planning on making att least two valve amps.
The first one must be a ULTRA easy reliable first time amp that works well even when constructed by a tube nube.

After that Id like a challenge and make the nicest stereo amplifier i can with what i already have, given that ill need to buy Transformers.

and lastly id like to know if this transformer from RS Comp. is good enough for the first small nube amp.
Buy Audio Transformer Multi-tapped output AF transformer,3.5W Oxford Electrical Products N35A002F online from RS for next day delivery.


Last edited by rwilson411; 15th April 2012 at 11:40 PM. Reason: Update link
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Old 16th April 2012, 09:19 PM   #2
rotaspec is offline rotaspec  New Zealand
diyAudio Member
Join Date: Nov 2007
Location: Nelson, NZ
Send me an email (gwmaz at xtra.co.nz) as I might be able to help with transformers.
A lot more detail is needed before you decide on a design (such as expected power out, input sensitivity etc), but have a look at the RH84 for a simple single ended 5W design using EL84s, and the El-cheapo (do search on here as the designer is here, Hi Eli) as a PP 6V6 (and equivalents) design for about 10w.

Gary (in Nelson)
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Old 13th May 2012, 04:59 PM   #3
nigel pearson is offline nigel pearson  United Kingdom
diyAudio Member
Join Date: Mar 2007
Location: Oxfordshire
Default OEP Transformer

In various forms that transformer has been in RS range for years . It is Dansette record Player standard . I hope you try one as I would be trilled to think it might work . The RH 84 Alex Kitic amp might work at a pinch with it .

Realistically you will need something better . If Kitic is to be beveled his amp would probably try very hard to make it give it's best . Old TV's had something similar . If the Kitic circuit had existed then my TV would have been converted . We did convert them to triode and no feedback ( PCL 86 typically ) . Voice quality better and bass clarity . ECL/PCL 82 would be ideal for that transformer .

Please someone do a Dansette .

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Old 13th May 2012, 07:19 PM   #4
Vostro is offline Vostro  South Africa
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Join Date: May 2012
Location: Other side of the fence
I am also going to use that Output Tranny from RS Components, it's cheap
I am going to build a ECL82 amplifier with a 235V-0-235V 0.06A , 6.3V 2A mains tranny.
Ill be using SS rectification. Don't Judge

I was thinking of
1.) Flea Power Vacuum Tube Amplifier - Tiny 3 Watt SE Amp (liking it for showing wiring layout) or
2.) Single Tube amplifier

Which is similar on Triode end and but different on Pentode end, Grid connection and values for different B+.

Can anyone help changing values for my Mains transformer.
And Filtering Circuit for B+
This will be my first tube project.
Im building a Stereo of 100W Ultimate Fidelity Amplifier for my wharfedale diamond 10.1's.
If this tube project goes well, maybe it will convince me to build a Tube amp for them instead.
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