1969 class A amplifier. While JLH 1969 is a simple design, it is still one of the best transistor amplifier.
This incarnation features :
1. Double-sided , thick copper PCB. Most of the JLH 1969 boards in the market are single-sided. This one is doubled-sided so the copper pad durability is greatly enhanced by plated-through hole ( PTH) process.
2. Hermetically sealed metal casing transistors used on both small signal and power stage.
3. High quality electrolytic capacitors.
4. High quality solder with silver content is used in soldering.
5. ERO film capacitors for audio coupling.
6. Thick & heavy aluminum plates already mounted on the board( as in the pictures) for easy to interface with heatsink.
Material at a glance:
* Shen Jin-sided PCB, gold, gold Balloon
* Import Panasonic black gold fever high frequency low-impedance capacitor
* Import pale blue ruby capacitance
* Import the new Motorola / 2N1711
* Import the new Motorola / 2N2907
* Disassemble MOT / 2N3055
* The new ERO green film coupling capacitors
* New Taiwan LELON axial audio output capacitance
* Panasonic foot blister chunill low drift resistor error thousandth, sweet vocals
* Customized industrial grade aluminum angle, fast heat transfer, corner store to buy an aluminum alloy aluminum not generally comparable
* Lead-free solder containing silver bass / midrange has lifting effect
Specifications:
Operating voltage: DC 12V-35V (corresponding to 9-26V transformer)
Output sound power: 10-15W or so.
It can be pushed 3-8 inches, 120 watts of power bookshelf box, full-range boxes. Sensitivity to be higher than 83db.
Board size: with angle aluminum long 10cm, width 8cm, height 3.8cm
Adjustable between quiescent current 0.3-1.8A, recommended 1.2 Ann (radiators need more than 0.7 kg, it is recommended to listen to the sound quality, I feel satisfied to buy aluminum heat sink chassis, because to buy a separate radiator is not cheap).
The midpoint of their own adjustments / quiescent current method:
Tune midpoint: universal table hit voltage profile, black pen then the red pen then GND TP1 test holes (TP1 at the output capacitor positive) board, the adjustable resistance KT1 it is 1/2 of the supply voltage.
Modulated current: 10A universal table hit stalls, a pen then positive power supply, the other one pen then VCC terminal, adjust the adjustable resistance KT2 change the current board size.
Package Included:
2018 2PC JLH1969 class A Amplifier Board High Quality PCB Assembled MOT/2N3055
1.We accept PayPal only.
2.All major credit cards are accepted through secure payment processor PayPal.
3.Payment must be received within 7 business days of auction closing.
4.We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay.
1.We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay.
2.Items will be shipped within 1-3 business day when we received payment.
3.Delivery time depends on destination and other factors;
4.International buyers please note:
a.Import duties, taxes and charges are not included in the item price or shipping charges. These charges are buyer’s responsibility. We will try our best to reduce the risk of the custom duties.
b.Please check with your country's customs office to determine what these additional costs will be prior to buying.
1.If the item is not as described or damaged in transportation, please send it back within 7 days upon date of receipt
2.For defective item, we guarantee free exchange or full refund within 30 days from the day of placing order
3.Buyers pay shipping fees at their own cost to return products for exchange or refund. We will be responsible for the postage of replacements
4.Items must be unused, in original packaging and include all parts, accessories and packaging
5.When we receive your returned item, we will investigate the situation and consider to offer replacement or refund according to the situation
1. All the items will be tested before shipping. Buy them with the confidence!
2. We maintain hightest buyer ratings StarStarStarStarStar and 100% customer satisfaction, Positive Feedback will be much appreciated from you.
3. Any dissatisfaction or problem, please contact us before you leave neutral Neutral feedback rating or negative Negative feedback rating feedback.
1.When you received package and like it, kindly comfirm received order and leave a positive feedback with full stars for us. Thank you.
2.Any dissatisfaction or problem, please contact us before you leave neutral Neutral feedback rating or negative Negative feedback rating feedback.