6P45S output beam tetrode. Equivalent to the EL / 6KG6. Made by Svetlana. tubes store. Menu: Magnum SE. Magnum Single-Ended. Schematic by David Wolze. Power W. The Hammond W output transformer (a K, W push-pull. 6P45S = EL = 6KG6 tube. Output tetrode. 6P45S = EL = 6KG6 tube. Output tetrode. Manufacturers: Svetlana, St. Peterburg, Russia In Stock: 0.

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I identified two vulnerable places where a great deal of noise could be induced through capacitive coupling and there is also sensitive to noise through induction from magnetic fields. The seller won’t accept returns for this item. The bias circuit is restricted to fit my purposes, it gives me a range of mA for the 6p45.

This seem to be the best range for these tube, and I think that it is the same for 6p45s too. See other items More As I wanted to build mono blocks I contacted the company that originally made the transformers and had a second identical power transformer constructed at a very reasonable price.

International postage and import charges paid to Pitney Bowes Inc. Upper -3dB point is found by turning the frequency up until the output voltage 6p4s5 0. For additional information, see the Global Shipping Programme terms and conditions – opens in a new window or tab. The heater wiring is done in stiff, thick and twisted wire with good clearance and 90 degree angle to the signal wires.


2x 6P45S / EL, EL, 6K6G, 6P42S / MATCHED PAIR # | eBay

This item will post to United Statesbut the seller hasn’t specified postage options. By continuing to use this website, you agree to their use. I made new printed circuit boards, both for the power supply and amplifier. So now we have a self-balancing circuit without the need to hand-select 12AX7s, also a very high impedance current sink in the cathode circuit, and also a form of local feedback within this stage to improve balance. Oh, I forgot the G2 regulator schematic.

I ran measurements on my HP A audio analyzer. Here is a video of the first time the amplifier is working at full input voltage and negative bias adjusted for mV over the cathode resistors. This first adjustment can be done with amplifier on at full voltage but with the output tubes taken out. There is some problems with hum that will have to be investigated. Skip to main content.

March 8, at The test housing is all made from scrap metal and so will the final version be. For a long time I have had a large quantity of 6P45S PL equivalent sweep power tetrodes lying around and have therefore looked for a amplifier design using these tubes.

The LTP avoids both these issues, but performs acceptably only when operating into a constant current sink. For additional information, see the Global Shipping Programme terms and conditions – opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees.


Parasitic oscillations still occur.

6P45S / EL509 / 6KG6 Svetlana Tubes Lot of 2 NEW

A constant voltage at the base of a bipolar device translates into a constant current at its collector, given a high beta. Leave a Reply Cancel reply Your email address will not be published. Sorry, your blog cannot share posts by email. Please enter up to 7 characters for the postcode. March 14, at I hope you find a old cheap oscilloscope to help you do the measurements.

I came across two 50 Watt output transformers and one power transformer to a very good price.

Item specifics Modified Item: Hey Mads, You might try a plate-to-plate feedback resistor between 6P45S plate and driver plate. Learn More – opens in a new window or tab.

Very good balance indeed! Add to Watch list Watching. The slight sloping of the square waves shows that the low frequency response is good and that the response of the amplifier 6p445s pretty flat. The amplifier circuit itself is soldered directly on to the sockets and a ground bar runs through the middle of the amplifier.

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Next step is to analyse the noise in a spectrum analyzer.