The Tube CAD Journal: Parrell tubes
Like many resistors held in parallel, many tubes held in parallel lower the effective resistance of the bundle. In other words, the effective rp of 6 12AX7s held in parallel is one sixth (about 10k) that of one 12AX7 (about 62k).
Designing a Preamp with Parallel Triodes - ampbooks.com
A Preamp Stage with Parallel Triodes. As Victor Mason states, a parallel stage increases the signal-to-noise ratio, which is particularly important in the first stage.
Series vs parallel tube circuits - 18Watt.com
Oct 19, 2021 · The parallel triode is a little fuller and maybe smoother than a single triode. There may be a slight increase in gain, but not necessarily perceivable. If you look at my EF86 Xtra …
An improved input circuit for parallel-tube VHF power amplifiers
In the input circuit of a typical paralleltube amplifier, the grids of both tubes are connected in parallel and matched to 50 ohms with a double-tuned, link-coupled circuit (see Fig 1). This circuit has virtually no latitude for balancing drive between tubes, thus eliminating one of the main advantages of parallel connection.
Series & Parallel Circuits - YouTube
This short video explains the basics of series and parallel circuits. It also covers how to determine which parts of a parallel circuit will or will not kee...
Series and Parallel Circuits - YouTube
Sep 4, 2016 · This physics video tutorial explains series and parallel circuits. It contains plenty of examples, equations, and formulas showing you how to solve it with ...
Parallel Push Pull Circuit? - diyAudio
Mar 10, 2015 · If you parallel tubes, you need to get them to share current equally. This usually means some degeneration resistors in the cathodes (some, maybe 25%, proportion of 1/gm nominal for the R's), and individual bias adjustments. Matched tubes (gm) would be a …
GCSE Physics - Parallel Circuits #18 - YouTube
Sep 15, 2019 · This video covers:- What parallel circuits are- How potential difference, current and resistance are split in a parallel circuit.General info:- Suitable for ...
parallel tubes - diyAudio
My goal is to build a 6P1P parallel PP, and be able to pull half the tubes, switch speaker connections and make comparisons. I plan on running a seperate grid resistor and coupling cap for each driver tube.
many parallel tubes lies in the lower output impedance and lower noise figure, both being highly desirable in a phono preamp. Like many resistors held in parallel, many tubes held in parallel lower the effective resistance of the bundle. In other words, the effective rp of 6 12AX7s held in parallel is one sixth (about 10k)
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