EL12N Quad made in Germany Röhren BTB matched Quartett
For double EL12SE builds, stereo PP and the BTB 8-cylinder amp
An SE DIY favorite playable as pentode or wired as triode
Musical, good-natured, stable, low spread from German production
EL12N matched quad – four German NOS pentodes for the single-ended and PP scene
Build with the EL12N once and you rarely stop at two tubes: the NOS highlight manufactured by RFT and distributed back then under the RSD label is so popular with DIY single-ended fans that the set of four becomes the natural order size – whether as a double complement plus spare for the BTB EL12SE from Klang+Ton, for stereo push-pull projects with two tubes per channel, or as replenishment for parallel SE concepts like our 8-cylinder amplifier.
BTB matches the quad on top of the inherently low factory spread into a set as if cast from one mold. The reward: the very musical, pleasant tone of this EL34 predecessor – as a pentode or in triode mode, where it cuts an equally fine figure – paired with good-natured, stable and long-lived operating behavior, a 1:1 match for all EL12 tubes and usable up to 450 volts.
Typical applications
- Double complement plus spare for the BTB EL12SE from Klang+Ton
- Stereo push-pull amplifiers with two EL12Ns per channel
- Parallel single-ended projects following the BTB 8-cylinder concept
- SE DIY experiments in pentode and triode configuration
Technical data
- Valve type
- power pentode, NOS production by RFT (RSD distribution label), predecessor of the EL34
- Base
- Y8A 8-pin steel tube base – no direct EL34 plug-in substitute
- Heater
- 6.3 V / 1.2 A per tube – budget 4.8 A total for the set of four
- Absolute limits (not operating points)
- plate voltage up to 450 V, plate dissipation 18 W per tube
- Selection
- BTB matching as a quad, building on the low factory spread
- Compatibility
- 1:1 with all EL12 tubes, operation as pentode or in triode mode
- Scope of delivery
- 4 tubes as a matched quad, NOS
- Country of manufacture
- RFT, Germany
Application and design notes
Four Y8A sockets, short signal paths and grid stoppers directly at the socket form the basis of an oscillation-free build with this steep pentode; triode mode adds one protective resistor between screen grid and plate per tube, and in parallel operation the tight matching keeps current sharing balanced. Size the power supply for 4.8 A of heater current and check the idle current of all tubes after installation. Lethal voltages are present – work only with proper qualification.
Questions about selection and use
How does the EL12N sound – and is triode mode worth it?
Yes, it convinces in both configurations: as a pentode it plays very musically, pleasantly and completely unforced, and in triode mode the tone gains one more degree of refinement. The good-natured, stable behavior of the German production remains the same either way – trying both is worth it.
Is the quad right for a DIY stereo push-pull amplifier?
Yes, with two EL12Ns per channel the quad is the complete complement of a stereo PP project: all four tubes come from one matching run, both channels operate symmetrically with identical drive behavior – at a set price that invites experimentation.
Does the quad fit the EL12SE and the BTB 8-cylinder?
Yes, it is the practical unit for both house projects: for the EL12SE it covers the stereo complement plus a measured-in spare, and the 8-cylinder with its paralleled EL12Ns is restocked set by set – the tight selection keeps current sharing between the parallel systems in balance there. For a full complement we gladly assemble the complete set on request.
Note: All brand names mentioned, such as Marshall, Fender, etc., are registered trademarks of their respective owners and are used here for descriptive and compatibility purposes only.
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Fact sheet on EU Directive 2011/65/EURestriction of the use of hazardous substances in electrical and electronic equipment (PDF, not accessible, 2 MB)
Source: IHK Mittelfranken
Tariff Number: 85408100
Country of Origin: DE
further Pairings
Delivery time: ca. 1 - 5 days
Delivery time: ca. 1 - 5 days