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6E5P SE, 6n1p driver, MAZE OPT's in a scrappy chassis for testings715 viewsThis is one of my latest audio tube DIY projects made in a scrappy chassis for breadboard use and measurements. I 'll transfer it to a nice wooden chassis now for sure.
The tube in output is the russian HF tetrode 6E5P, with max anode dissipation 8.5 Watts. It's a hell of a driver together with a CCS or Choke loaded solution. The driver is a classic ground cathode with the 6n1p for both channels. The 6n1p cathodes are not cap bypassed so the gain in this operating point is ~ 8. This is what exactly needed to drive the 6E5P in full output without the use of a preamp. The PSU is a tube type one using the Sovtek 5AR4. All the PSU caps are MKP (Mcap by Mundorf 100μF/400v.
By the way there is no Electrolytic cap in this Frankie amp. The cathode bypass cap on the 6E5P stage (output) is also MKP by Solen 82μF/250V. The coupling cap from driver to 6E5P grids is RC type using the marvelous 0.22/1000V PIO K40Y Russian caps. The OPTS are a bit over sized with 5K primary impedance made by mazeboutique.com.
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DIY 6NS7-KT88 Monoblock Tube Amps1221 viewsI purchased these extreme valve monoblocks from Dan in Australia, who built them from the ground up, for a song. They are based on the uni-amp cct. brd. You can plug and play KT88(s), 6L6(s) and EL34(s) output valves and switch between pentode and triode mode. The transformers are oversized and were special wound for Dan. Each block weighs over 22kg. The input and driver tubes are Golden Dragon 6SN7(s) with tube rectification. It uses tranni input coupling. Power is 27W.
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Prada OPA627 Preamplifier386 viewsUsing my daughter's Prada phone box (heavy cardboard) I fashioned this preamplifier around the Bur Brown (high performance) OPA627AP opamp ($AU50). It is a single stage preamp and powered by four lithium 9V batteries for a PS of 18V.
The black knob is solid brass and the attenuator is an Alps Blue Velvet. Gold RCA jacks, silver wire and WBT silver solder are used throughout.
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LM3875 Gainclone on Breadboard1794 viewsLM3875 Gainclone. The circuit is the same as Mark's LM3875 Gainclone. Most of the parts are from Dick Smith which can also be found at Radio Shack.
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KT88 SE UL tube power amp-finished32 viewsI had put the partially finished amp in the gallery some weeks back. Now finished not a lot of difference on the outside except for the many silver colored screws on the top plate and some feet. See the other image for the underside shot. After a number of hours of careful listening and listening to it though others CD players, pre-amps and speakers I can say that most liked the sound. SE tube amps produce absolute and exquisite mid-range and silky highs and deep sound stage but this amp has a slightly narrow sound stage presentation. Bass improved and hum vanished with additional PS filter caps. With a brushed Al top plate and Mirabue timber thick timber base, Edcor XSE OPTs and component-2-component wiring on all circuit boards (including rectifier broard) this amp represents a clean and easy build with in-expensive parts. Though low powered (6W+) for a few hundred dollars you can experience the benefits of a tube SE UL design. So easy, so nice!Nov 01, 2009
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KT88 SE UL tube power amp-underside34 viewsThe underside of a KT88 SE UL power amp consists of, Edcor XSE series OPT, Hammond 10H choke, rectifier unit with SF diodes and 200uF of filtering. Turret boards were used for the KT88 sockets (ceramic), cathode resistors and bypass caps. All other components are wired, point-to-point, on a smaller circuit board X2 caps are used for the coupling caps. All component are inexpensive and readily available. The amp suffered from hum until the filter caps were increased. 100uF before and after the choke are required. The PS delivers a very quiet 410V. 30V is dropped across the cathode resistors which provide the biasing to the power tubes. At idle 63mA is drawn per tube. The sound is extended and detailed with a 6W delivery. Excellent sound stage depth. Frequency range is from 35Hz to 46kHz (-3dB points).Oct 31, 2009
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5751 SRPP / EL84 (6BQ5) Push-Pull Tube Amp (PoddWatt)63 viewsAnother OddWatt tube amplifier. This one uses EL84 / 6BQ5 tubes in a self-inverting push-pull topology for the output stage driven by a 5751 SRPP. The gain is sufficient to allow direct connection to a portable mp3 player. As will all the OddWatt amplifiers, it measures very well and Bruce reports that it sounds very good. See the 5751 SRPP / EL84 (6BQ5) Push-Pull DIY Tube Amplifier project page for full details.Oct 19, 2009
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6V6 12AX7 Stereo Amp133 viewsLittle stereo vacuum tube amplifier built for a friend who wanted a tube stereo at minimal cost. It used mainly parts on hand, including a vintage radio power transformer, vintage tube sockets, and NOS 5 watt Zenith audio output transformers made for 6V6 single-ended output stages. The driver tube is 12AX7 and the tube rectifier is 5Y3G. Output tubes are old Zenith 6V6G tubes, the tall ones that look prettier than the GT style. The tube amp delivers great sound with an MP3 player as the audio source.Oct 10, 2009
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