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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: 22 Nov 2011, 21:11 
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Bruce's shares detailed listening notes for 6 phono preamplifiers including the Groovewatt. See an Informal Comparison of Six RIAA Phono Preamplifiers for full details.

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PostPosted: 30 Sep 2012, 20:48 
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Bruce Heran shares the design and construction of monoblock Push-Pull EL84 (6BQ5) valve amplifiers. The Mini Block tube amps use a 5751 twin triode to drive the EL84 push-pull output stage which is biased into class-A operation, ultra-linear mode. Output power is 5.8 W @ 2% and at 1 W distortion is 0.25%. The frequency response is 10 Hz to 44 kHz within 0.2 dB. Bruce reports that the Mini Blocks are more powerful than the Poddwatts and seem to have more detail while retaining all the good characteristics of the Poddwatt amps.

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Project Link - Mini Block Ultra-Linear Class-A Push-Pull EL84 (6BQ5) Valve (Tube) Amps.

Support / Discussion Thread - Mini Block class-A PP EL84 Amp project forum thread

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PostPosted: 24 Nov 2012, 18:15 
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Bruce Heran outlines the design and construction of a low power 6DJ8 (ECC88) tube headphone amplifier. The headamp circuit uses one 6DJ8 tube per channel in push-pull operation biased into Class-A. The headphone amp is suitable for use with many Hi-Fi headphones. See the DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project page for full details

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Project Link - DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project

Support / Discussion Thread - 6DJ8 (ECC88) Tube Headphone Amp Project thread

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PostPosted: 15 Dec 2013, 19:46 
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Matt describes the design and construction of the 4S Universal Tube Preamplifier. The 4S Universal preamp is a super simple single stage line level Hi-Fi preamplifier that will work with any of the 9-pin miniature 12A*7 twin triode tubes (12AU7 12AV7 12AY7 12AT7/12AZ7 12AX7). You can change tubes to vary the preamplifier gain. See the 4S Universal Preamplifier for 12A_7 Tubes page for full details.

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Project Link - 4S Universal Preamplifier for 12A_7 Tubes.

Support and Discussion Thread - 4S Universal Tube Preamp Project (12A*7) thread.

Additional Information - Mark's 4S Universal Valve Preamps.

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PostPosted: 24 Mar 2014, 20:45 
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This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. As a thank you for the 300B amplifier schematics, Stamou has shared his implementation of the 300B single-ended tube amplifier schematic by J.C. Morrison. The 300B SET amp uses a 6SN7 direct coupled driver stage and an all low mu triode array. The power supply filtering sections have been duplicated for each channel for this 300B triode amplifier and premium parts are used throughout. The audio output transformers are Lundahl LL1623. This is a great sounding 300B triode amplifier that I am sure DIYers will find very rewarding. See the DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier project page for full details

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Project Link - DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier

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PostPosted: 29 Jun 2015, 18:46 
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Matt describes the design and construction of a Single-Ended Triode (SET) amplifier built around a pair of 6EM7 double triode tubes. The clean output power from the 6EM7 SET amplifier is about 2.2 Watts per channel with a frequency response that matches the audio output transformers. The single-ended 6EM7 amplifier is housed in a vertical wooden chassis that has been styled after early vacuum tube equipment of the 1920s. The 6EM7 SET amplifier uses a 6CA4 tube rectified power supply with excellent channel separation and which is very quiet. Matt reports that the 6EM7 amplifier sounds wonderful! The bass is well articulated without being boomy, mid-tones are clear and even, and the highs are crystal clear. See the 6EM7 Single-Ended Triode (SET) Vertical Amplifier page for full details

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Project Link - DIY 6EM7 Single-Ended-Triode (SET) Hi-Fi Amplifier

Support and Discussion Thread - Vertical 6EM7 Portable Amp thread.


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 Post subject: Re: DIY Tube Projects
PostPosted: 31 Jul 2016, 10:16 
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This inexpensive Single-Ended Triode (SET) amp is built around a pair of 6CY7 vertical deflection dual triodes built for TVs. At full output the amp produces a clean 1.3 Watts output per channel into 8Ω. The Edcor XSE output transformers are rated from 70Hz to 18kHz. This amplifier did a little better than this having a -3dB bandwidth from about 46Hz to about 30kHz. The 6CY7 stereo amp uses a 6CA4 tube rectified power supply with excellent channel separation. Matt reports: This is quickly becoming my favorite amp. I currently have a set of NOS Sylvania tubes in it, but I have also used a set of old used GE tubes which sound just as good. I highly recommend that anyone looking for a little iPod or computer amp give this one a try.

See the 6CY7 Single-Ended Triode (SET) Amplifier page for full details

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Project Link - DIY 6CY7 Single-Ended-Triode (SET) Hi-Fi Amplifier

Support and Discussion Thread - 6CY7 Stereo Amp thread.

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