HEC M300D Holden Ham Cb Radio Linear Amplifier Watts Tube 6LF6

( Brand: Hec ), ( Model: M300D ), ( Part Type: Radio Amplifier Tube ), ( Band: Ssb ), ( Output Power: 300w ), ( Supported Modes: Am ), ( Amplifier Class: Tube ), ( Modified Item: No )

Review HEC Holden Electronic Ham Cb Radio Linear Amplifier 300 Watts Tube

The M300D HEC Holden Ham CB Radio Linear Amplifier is a powerful and high-performance upgrade for your CB radio system. This tube amplifier, utilizing the 6L6 tube, delivers an impressive 300 watts of output power, ensuring your transmissions are heard loud and clear over long distances.

The M300D is designed with a sturdy, all-metal construction, boasting a robust and rugged appearance that matches the durability you'd expect from a HEC product. This amplifier features an intelligent SWR protection circuit, which safeguards your radio from damage caused by improperly matched antennas or mismatched impedances.

The M300D also includes a built-in heat sink, ensuring efficient dissipation of heat, preventing overheating, and maintaining optimal performance. The amplifier is compatible with a wide range of CB radios, making it a versatile choice for many different setups.

Furthermore, the M300D is easy to install, with a user-friendly interface that allows for simple adjustments and settings. This amplifier is an excellent choice for serious CB radio enthusiasts seeking an upgrade in power, clarity, and durability. With the M300D, you're not just amplifying your signal; you're enhancing your entire CB radio experience.

1. Power: With a maximum output power of 300 watts, this amplifier can deliver a strong and clear signal, making it ideal for long-distance communication.

2. Tube Type: The use of a 6LF6 tube amplifier ensures a warm, natural sound quality that is often preferred by many radio enthusiasts.

3. Durability: The M300D is built to last, with high-quality materials and construction that can withstand regular use.

4. Versatility: This amplifier is compatible with a wide range of CB radios, making it a versatile option for many users.

1. Size and Weight: Due to its size and weight, this amplifier may be difficult to transport or install in smaller vehicles.

2. Power Consumption: The M300D consumes a significant amount of power, which may increase the overall energy consumption of your vehicle.

3. Maintenance: Tube-based amplifiers require regular maintenance, including regular tube replacement and cleaning, which can be time-consuming and costly.

4. Potential for Overheating: The M300D can generate a lot of heat, which may require additional cooling measures to prevent damage to the amplifier or your vehicle's electrical system.

The M300D HEC Holden HAM CB Radio Linear Amplifier is a powerful and high-quality option for CB radio enthusiasts who prioritize a strong and clear signal. However, its size, weight, power consumption, and maintenance requirements are important considerations to keep in mind. If you are willing to invest the time and resources needed to maintain this amplifier, it can be a great addition to your CB radio setup.

If you are looking for a powerful CB radio amplifier with a warm, natural sound quality, the M300D HEC Holden HAM CB Radio Linear Amplifier is a worthwhile consideration. However, make sure to research and understand its requirements and limitations before making a purchase. If you are unsure about whether this amplifier is right for you, consider consulting with a CB radio expert or doing more research to ensure that you make an informed decision.

Details:

I'm sure on ssb is where it moves up into the upper 200s. This amplifier is in pretty good condition showing some very minor visible signs of wear. I have made no attempt to power-on this unit or test in any way.

If I recall with cb radio 4w dead carrier in - it was doing 180w out on high am and would swing well into the 200s. Keep in mind that was 15 years ago. Ships to 48 states only USPS or ups packaged well.

It has been stored in a climate controlled environment its entire life. The has not been used in approx 15 years. When last used, it operated without issue.

Overall, however, the amplifier still appears to be in good dusty condition. Note it is dusty and should be cleaned serviced before any attempt to operate. I have owned this over 20 years.

The Hec is a 300 watt 4 tube 6LF6s am ssb amplifier with hi lo output.

part #: m300d prices

• $15.00-$175.00

specifications hamamateuradio:

• brand: Hec
• model: M300d
• part type: Radio Amplifier Tube
• band: Ssb
• output power: 300w
• supported modes: Am
• amplifier class: Tube
• modified item: No

Returns hamamateuradio:

• policy: no returns

Payments hamamateuradio:

• PayPal

Ratings:

1. Vary happy customer 01-19-19
2. Great deal super shipping highly recommended 5-STARS!!!!!! 01-22-19
3. Good buyer, prompt payment, valued customer, highly recommended. 01-23-19
4. the item exceeded my expectations, I would purchase from the seller again 01-21-19
5. Excellent buyer, thank you very much!!! - Pixel Pro Audio 01-22-19

Seller hamamateuradio:

• city: Colorado Springs, Colorado
• # feedbacks 01-24-19: 7892
• rating 01-24-19: 100.0%
• zipcode: 80918

General hamamateuradio:

• condition: For parts or not working
• in stock: Yes
• Ham, Amateur Radio > Ham Radio Amplifiers

Shipping hamamateuradio:

• cost: $21.85
• handling: 1 days
• type: Flat

Offer hamamateuradio:

• best offer: false
• Started: January 23, 2019, 4:25 pm
• bids: 0
• quantity: 1
• Sold: 0

Hec M300D Is Similar To:

• M300e Hec Vintage Ham Radio Transmitter Electronics Co (37.7% similar) This is a vintage Hec M300E, Houston electronics co. I have no way of testing this piece. All the switches knobs are still there with gauge on front. It belonged to my late uncle. Tubes are 2N2156 its all original with. 12 CDC, MIT ant. It can be used for parts or refurbished...(July 11th, 2018)
• Hec M125c Excellent Looking Holden Electronics 125 Watt 10 And 12 Meter Amplifier (51% similar) Images may not be unique. Buyer to add $14. Includes mobile mounting bracket, photos are the actual Hec M125C amplifier serial no. Shipping charge may not include AK or hi. Excellent looking holden electronics Hec M125C 125 watt 10 12 meter amplifier, amplifier - uses two 6JU6 sweep tubes for RF ...(May 6th, 2024)
• Hec M100e Cb Mobile Linear Signal Amplifier Am Ssb With Pre Amp Parts repair (45.8% similar) I don't know a lot about these items. You get both in the photos. It is being sold as. I have not tested it in any way...(January 29th, 2025)
• Hec Holden Electronics Co M200d Vintage High Performance Ground Grid Linear Amplifier With Box (55.2% similar) Offers high performance and a ground grid feature for enhanced communication capability. The vintage holden electronics high performance ground grid linear amplifier, model M200D, is a tube amplifier designed for ham radio enthusiasts. The product comes in its original box, adding to collectible ...(April 29th, 2025)
• Hec Holden Electronics M125e Vtg M125e ml-250 6ju6 Linear Amplifier Untested (61.1% similar) Because I have no personally tested it, to sell it as is. Here to see my other listings. No major wear or damage but it is ever so slightly dirty on the inside from sitting around. In pretty decent condition. Listing is for the item you see pictured, VG Hec holden electronics M125E/ML-250 6JU6 ...(October 21st, 2025)