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Roger's Tube Amplifiers & Transformers Homepage

Roger's Tube Amplifiers and Transformers Homepage. Welcome to Roger's Homepage! Created by Roger Knopp, M.Sc.E.E. Musiclover as I am, I've been building several tube amps since 1991. This includes two MM preamps, a guitar amplifier and three former versions of the power amplifier KEW88-91D. This is a black version of the amplifier seen above. I now have. Six of these for sale. I will sell them with brand new output tubes. KT88's) and brand new Russian driving tubes (6H8C's). Price is only 700 USD.

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Roger's Tube Amplifiers & Transformers Homepage | knopp.se Reviews

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Roger's Tube Amplifiers and Transformers Homepage. Welcome to Roger's Homepage! Created by Roger Knopp, M.Sc.E.E. Musiclover as I am, I've been building several tube amps since 1991. This includes two MM preamps, a guitar amplifier and three former versions of the power amplifier KEW88-91D. This is a black version of the amplifier seen above. I now have. Six of these for sale. I will sell them with brand new output tubes. KT88's) and brand new Russian driving tubes (6H8C's). Price is only 700 USD.

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Roger's Tube Amplifiers & Transformers Homepage | knopp.se Reviews

https://knopp.se

Roger's Tube Amplifiers and Transformers Homepage. Welcome to Roger's Homepage! Created by Roger Knopp, M.Sc.E.E. Musiclover as I am, I've been building several tube amps since 1991. This includes two MM preamps, a guitar amplifier and three former versions of the power amplifier KEW88-91D. This is a black version of the amplifier seen above. I now have. Six of these for sale. I will sell them with brand new output tubes. KT88's) and brand new Russian driving tubes (6H8C's). Price is only 700 USD.

INTERNAL PAGES

knopp.se

1

Roger's Power Transformers

http://www.knopp.se/knopp/trafo_power.html

Designed by Roger Knopp, M.Sc.EE. Phone/fax: 46 31 252345. KE77003-B, Roger's Williamson Supply Transformer. KE87060, Roger's Universal Power Transformer. KE77003-B, Roger's Williamson Supply Transformer. KE87060, Roger's Universal Power Transformer.

2

Roger's Williamson Amplifier Mk IV

http://www.knopp.se/knopp/power_d.html

Roger's Williamson Amplifier Mk IV. Designed by Roger Knopp, M.Sc.EE. Phone/fax: 46 31 252345. The amplifier KEW88-91D seen in this page is my fourth and final attempt in building a modern, good and cheap stereo Williamson Power Amplifier. The chassis is handmade of solid Pine. Power Consumption: 150W@230/115V 50-60Hz. Heater Voltage: 2X6.2V@4.2A (1.5A@6550). Closed Loop Gain: 20dB. Std Feedback (BF 1): 15dB. BW ( /-3dB): 7Hz-280kHz@67mW. Output Power (4-8R): 2X20W/6Ohm/1kHz/10%THD.

3

Roger's Williamson Mains Transformer

http://www.knopp.se/knopp/trafo_power_b.html

Phone/fax: 46 31 252345. The KE77003-B tube mains transformer, which is a modern version of Williamson's specifications from 1947, has the following design parameters:. 2X350V@0.15A (Imax=0.3A). Total primary resistance: 7 Ohm. Total HV secondary resistance: 86 Ohm. Effective std rectifier drive impedance: 16 43=59 Ohm. KE77003-B, Roger's Mains Transformer. Which makes the transformer useful as:. Mains transformer using boosted Williamson configuration with KT88/6550 (somewhat lower dc and heater voltage).

4

Roger's Output Transformers

http://www.knopp.se/knopp/trafo_output_c.html

Phone/fax: 46 31 252345. This special cored low leakage symmetrical wound KE57613-C tube output transformer, which meets or even exceeds Williamson's specifications from 1947, has the following design parameters:. Total primary inductance: 80H@5V/50Hz (95H@10V/50Hz). Leakage inductance: 47mH (42kHz@KT66 p-p drive). Total primary DC resistance: 200Ohm. Maximum power input: 50W@230V/15Hz. Inductance vs DC unbalance: 67H@ /-5mA (33H@ /-20mA). KE57613-C, Roger's Williamson Output Transformer.

5

Roger's PNP Germanium Pre-Amp

http://www.knopp.se/knopp/pre_ge.html

Roger's PNP Germanium Pre-Amp. Designed by Roger Knopp, Roger Olsson and Roger Bergstrom. A small step for mankind, a giant leap for us Rogers. Now we are kind of getting there. Here is yet another step. Here you can see some wireing also. Here are some preliminary tests. Here is the final amplifier driven by Knopp's iPod. Knopp got tinnitus after this test. Roger's PNP Germanium Pre-Amp Schematic. Roger's Germanium Slow Start Power Supply Schematic. Roger's Germanium Pre-Amp Component List.

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Roger's Tube Amplifiers and Transformers Homepage. Welcome to Roger's Homepage! Created by Roger Knopp, M.Sc.E.E. Musiclover as I am, I've been building several tube amps since 1991. This includes two MM preamps, a guitar amplifier and three former versions of the power amplifier KEW88-91D. This is a black version of the amplifier seen above. I now have. Six of these for sale. I will sell them with brand new output tubes. KT88's) and brand new Russian driving tubes (6H8C's). Price is only 700 USD.

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