Jolida JD 505
Jolida JD 505 valve integrated amplifier, KT88 push-pull delivering 2x55 watts into 8 ohms, for dynamic listening and taut bass.
Description
The Jolida JD 505 is a valve integrated amplifier built around a push-pull arrangement of four KT88 tubes, biased in class AB according to an ultra-linear topology. This is a complete unit, incorporating both the preamplifier and the power stage, allowing sources and speakers to be connected directly without intermediate electronics.
Its stated power output is 2 x 55 watts into 8 ohms, with 4 ohm compatibility depending on the speaker configuration used. The use of KT88 tubes in push-pull is recognised for offering good bass control and pronounced dynamics, two qualities this arrangement specifically aims to exploit. The unit has four source inputs, enough to connect several elements of a hi-fi system, and can also be operated remotely via a supplied remote control.
This type of amplifier is aimed at a valve sound enthusiast looking for an integrated electronic unit capable of driving demanding speakers, without having to use separate preamplifier and power amplifier boxes. The integrated format simplifies installation while retaining the sonic qualities specific to push-pull tube operation.
Technical specifications
| Power | 2 x 55 W into 8 Ω (4 Ω compatible) |
| Number of inputs | 4 |
| Tubes | 4 x KT88 |
| Circuit | Ultra-linear push-pull, class AB |
What to check before buying used
On a valve amplifier of this type, the first check concerns the four KT88 tubes: their wear affects both the sound quality and the balance of the push-pull, and a mismatched or worn set will result in a loss of dynamics, or even hum. The volume potentiometer deserves testing at all positions to detect crackling or an imbalance between the two channels, while the coupling capacitors, sensitive to age, may explain a dull or unstable sound after several years of operation. It is also advisable to check the presence and condition of the supplied remote control, as well as the correct operation of the four inputs.
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