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Home > Finished Products > (A41) 1:1 Replica UK EAR Circuit MM Phono Preamp Board, Direct Copy Finished Board, RIAA Vinyl Amplifier

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(A41) 1:1 Replica UK EAR Circuit MM Phono Preamp Board, Direct Copy Finished Board, RIAA Vinyl Amplifier

Name: (A41) 1:1 Replica UK EAR Circuit MM Phono Preamp Board, Direct Copy Finished Board, RIAA Vinyl Amplifier
Brand: Emoryseric | HiFi Music Muse
Price: 47.31 USD
Availability: InStock

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Description

Options:
Version 1: C) Deluxe version without signal base potentiometer
Version 2: A) Deluxe version includes potentiometer signal base
Version 3: 115V input voltage transformer
Version 4: B) MM+MC electronic transformer version
Version 5: Chassis empty case includes knobs, switches, power socket, fuse
Version 6: 230V input voltage transformer

Direct scan reproduction from original unit, follows original unit's craftsmanship and components. 2.0mm PCB thickness, component through-hole with copper wall plating process.

Transformer secondary voltage requirements: AC110V >30mA, AC28V >500mA. Uses 3 vacuum tubes, model 12AX7. (All kit prices do not include vacuum tubes)

Mainboard dimensions: 114mm x 194mm. Matching transformer dimensions: 90mm x 90mm, height 45mm.

Chassis internal height requirement: 80mm. For vertical transformer mounting, height requirement: 90mm.

Transformer and chassis are only sold together with the kit board. Not sold separately.

Do not use an aluminum alloy chassis. Aluminum alloy does not provide shielding/isolation against radio waves, transformer magnetic flux lines, or mobile phone interference! Using an aluminum shell for a vacuum tube amplifier is a major mistake and shows ignorance.

We have over 3 years of experience and have sold over 2000 sets of this circuit kit worldwide. We possess rich production experience with this circuit. The scanned version has relatively high component requirements. There are quite a few shops and hobbyists making kits for this circuit. Because the original circuit has a unique gain of over 200 times (approx. 47dB), it is rare among MM phono stages and specially adds a potentiometer for output adjustment. General MM phono stages have 100x gain. Achieving over 200x gain requires massive testing and selection of transistors in the circuit to be competent. We have tested boards from several makers of this circuit kit, and their output gain is insufficient, not even reaching 100 times. If this fundamental specification is not met, it's merely copying the appearance superficially, and the sound quality cannot possibly be guaranteed.

The following shows the production craftsmanship of this kit and pictures of the original unit from different periods. These are not included in the price of this product. For DIY reference only.

The following are pictures of the MM+MC electronic transformer version for reference.

Equipped with 9V (Ni-MH) rechargeable batteries, there is no risk of accidental over-discharge rendering them useless! After slow charging for several hours, they can recover to their original voltage state. However, Ni-MH battery performance and sound quality are not as good as lithium batteries.

For users who configure their own lithium batteries: To prevent forgetting to turn off the unit and completely draining the lithium battery (which would render it useless), after listening, either turn off the machine's power or leave the power on but set the signal selection switch to the MM compatible charging position.

Many non-major brand lithium batteries labeled as 9V actually have a full charge voltage of only 8.4V. Please pay attention when purchasing.

The following are pictures of the original unit for appreciation and reference only. They are not included in the product transaction price.

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(A41) 1:1 Replica UK EAR Circuit MM Phono Preamp Board, Direct Copy Finished Board, RIAA Vinyl Amplifier

Quantity:

CUSTOMER REVIEWS

You May Like

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