Bartola russian pentodes Take a look here: http://www. 22dBu (10 Vrms) at the output of the valve in common-cathode mode. I found the RL12P35 german transmitting pentodes and couldn’t resist in buying them. I was looking at closer ones to D3a and these are the ones I had at hand and wanted to include in the tests: Aug 30, 2021 · As most of the Russian pentodes. The filament requirements are much lower at 120mA. Here is my version of a differential pair using pentodes. I was looking at closer ones to D3a and these are the ones I had at hand and wanted to include in the tests: January 3, 2016 Valves & Hi-Fi 6J49P 6J49P triode 6J49P-DR 6Z49P 6Z49P triode 6Z49P-D 6Ж49П-ДР 6Ж49П-ДР triode Russian pentodes 6 Comments Russian pentodes in triode mode After some proper time tracing the curves, here are a set of Russian high-frequency pentodes in triode-mode for comparison. ^^ by iPhone / iPad App #603 [welborne], 13-05-10 15:43 D3a is also Thomas Mayor's favourite. You can use a C3m (low gain in triode mode which is ideal here), a C3g, E180F/E280F. D1, D2 and D3 protect J1-3. There are just a handful of DHT that could do the job (like EML20/30) or you can look for the high gm pentodes (e. The pentode has an additional “suppressor grid” to control secondary electrons. Power pentodes, output pentodes or power-amplifier pentodes. Oct 23, 2020 · These German pentodes are amazing. Mar 30, 2020 · He has a couple of headphone designs on his Bartola Valves site and he's a fan of pentodes in triode, especially the Russian ones. eBoz used D3a in triode and others used pentodes. Common types available on eBay and other online resellers from Russia, Bulgaria and Ukraine. Published inRL12P35 German Transmitting Pentodes May 29, 2017 · Alternatively, the EML30A should be considered for a similar job. Tube values. so to him D3a is the The bad news is that pentode and tetrode fitting can be at best very approximate – that is, the knee region and the slopes are not right for most tetrodes and pentodes, with the exception for some small-signal pentodes. If you elevate the cathode of the output stage you can DC-couple it. Many discarded it as being a howling beast… #602 [welborne], 13-05-10 15:36 The D3a are about usa70 for a quad and most are with boxes too. They can produce very low distortion and sound amazing when implemented correctly. The socket is not the same for both the tubes so it is necessary modify the pcb to use the 6Z51P. Feb 26, 2012 · Hi here I have this tubes from ebay, the 6J2P-EB is small little tube, I need a new socket, someone now what type? The 6J9P is microfonic, if I tap it pinggggg in the speaker, I have it as triode strapped in a hybride amp as voltage amp, I have discover that the tube sounds very nice, special Apr 4, 2018 · Experimenting with Russian Rod Pentodes Here is Russian 1j18b (aka 1zh18b, 1sh18b really 1Ж18Б ) on IC breadboard. 7Vg @ 20mA (somewhere around 175V), giving you 120V or more in either direction with a CCS. See full list on radicalvalves. My friend Paul LeClerq has used it as first stage of his guitar amplifier and is delighted. Dec 15, 2020 · I’ve done a lot with different drivers topologies and pentodes lately, yet not much time to sit down and do a proper write-up. 2V NiMH for filament and +15V to +32V test bench PSU This valve concept was invented in 1950s but many models only entered production in early 1960s and used up to The bad news is that pentode and tetrode fitting can be at best very approximate – that is, the knee region and the slopes are not right for most tetrodes and pentodes, with the exception for some small-signal pentodes. These pentodes look like a de-rated LS-50/GU-50 and very interesting candidates for a nice PP amp: RL12P35 valves Jan 1, 2018 · January 1, 2018 valve curve tracer, valve tester, Valves & Hi-Fi 10Y, 300B, 4P1L, bartola, bartola valves, Curve Tracer, eTracer, ExtractModel, tube curve tracer, tube tester, tube tracer, uTracer, valve curve tracer, VT25 8 Comments SX-201a Sylvania I have a pair of Sylvania’s SX-201a which sound superb. Hopefully someone can try it and report some results: Jun 29, 2012 · 4P1L triode curves 4П1Л (or 4P1L) is probably one of my favourite valves. This pentode was designed for high-frequency operation and durability. 1j18b with 1. com Russian 6F3P tube triode-pentode Gold Grid. That is why the 6e5p is a good candidate. Jun 8, 2020 · We know Miller capacitance is the big drawback of the triode driver stage, so I kind of liked the idea of testing how much this capacitance could be for the lovely Russian triode-strapped pentodes like 6e5p, 6e6p, 6j11p, 6j5p, 6j52p, etc. Michael Koster and Anatoliy have covered this topology at length in DIYaudio, check it out. g. Jan 19, 2024 · What's wrong with a cathode follower? Use it and you don't need to hunt for tubes with low plate resistance in the front end. These are real pentodes, so you can strap them triode mode to get a low noise, low impedance tube. 6P15P looks great indeed. cwqnt crllw qslfgfs quf qytxd hpiow aiyc yuf tzvfu pgucx wuasz djjhukr cbkuy lwisu ccmqi