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RS242-H

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RS242-H

History:
Sep/23 ∼ Sep/24 : Stradi RS242
21/Sep/24 ∼ : Stradi RS242 -> Stradi RS242-H (The model name is changed)

Summary:
 The Stradi RS242-H is based on the Stradi RS242 and is designed to have a higher amplification factor.
Stradi RS242-H is NOT 100% compatible with Telefunken RS242.
Be sure to consult a professional before use.

 This model has been improved to reduce microphonics, which is the most problematic in pre-amps using DHT tubes.

 We have developed and tuned this product for over 5 years. We hope listeners can fully focus on the music without microphonics, especially in pre-amps using DHT tubes.
All vacuum tubes we provide are improved for audio purposes, but this model especially has been made to enjoy music with wonderful sound.

The Stradi RS242-H is based on the Stradi RS242.
It is designed to have a higher amplification factor.

The Stradi RS242-H is NOT 100% compatible with Telefunken RS242.

  The difference of mu
Stradi RS242 /Telefunken RS242  : mu 17
Stradi RS242-H  : mu 21

The -H in RS242-H stands for "High Amplification Factor".
Generally, when you use RS242 tubes in preamps or drive stages, you can often find that the amplification factor is insufficient.
In particular, the mu of RS242 is often insufficient in transformer coupled preamps.
Therefore, we developed RS242-H with higher mu than RS242.
For instance, if there are problems caused by insufficient overall gain in preamps, you can easily solve it by using RS242-H.

The Stradi RS242-H tube is extremely suppressed in generating microphonic, which is the biggest problem when using a direct heating tube.
If you use the Stradi RS242-H tube, you can focus on music without thinking of microphonics in DHT Phono Amp or DHT PreAmp, which was previously considered impossible to use.

Available in matched pairs, quad sets, and singles.

  • Availability In Stock
  • Lead Time 3 ~ 14 days
  • Price$390.00
FEATURES

  • Note: Higher amplification factor than original Telefunken RS242
  • Ladder type Frame Grid
  • Material of minimizing filament end-loss
  • Anti-microphonic structure
  • Electrophoresis filament coating
  • Dual Getters
  • Eco-friendly paper packaging


FILAMENT RATINGS

  • Filament Voltage : 4 Volt (AC or DC)
  • Tolerance on filament voltage : +-2.5 %
  • Filament Current : 0.77 Ampere


MAXIMUM RATINGS

  • Maximum Anode Voltage : 400V
  • Maximum Anode Dissipation : 12Watt
  • Maximum Anode Current : 40mA


RECOMMENDED SINGLE ENDED OPERATING POINTS

  • Anode Supply Voltage : 300V
  • Grid Voltage : -7V
  • Anode Current : 8mA
  • Transconductance : 3000 µmhos
  • Anode Resistance : 7000 Ω
  • Amplification factor : 21


TUBE CURVES


DIMENSIONS & BASE

DIMENSIONS

BASE

Related Product

RS242