--- product_id: 153458208 title: "6J1 Valve Preamp, Vacuum Tube Preamp Valve Preamp Amplifier Board Audio Amp Assortment Kit" brand: "yanmis" price: "$40.42" currency: USD in_stock: true reviews_count: 9 category: "Yanmis" url: https://www.desertcart.us/products/153458208-6j1-valve-preamp-vacuum-tube-preamp-valve-preamp-amplifier-board store_origin: US region: United States of America --- # Dual power input: DC 5.5*2.5 & AC 12V transformer 6J1 vacuum tube for warm, rich audio tone 9x 470µF capacitors for ultra-clean power 6J1 Valve Preamp, Vacuum Tube Preamp Valve Preamp Amplifier Board Audio Amp Assortment Kit **Brand:** yanmis **Price:** $40.42 **Availability:** ✅ In Stock ## Summary > 🎶 Unlock the warm glow of vintage sound with modern DIY flair! ## Quick Answers - **What is this?** 6J1 Valve Preamp, Vacuum Tube Preamp Valve Preamp Amplifier Board Audio Amp Assortment Kit by yanmis - **How much does it cost?** $40.42 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/153458208-6j1-valve-preamp-vacuum-tube-preamp-valve-preamp-amplifier-board) ## Best For - yanmis enthusiasts ## Why This Product - Trusted yanmis brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pure Analog Warmth:** Experience authentic valve sound that elevates your music and voice with rich, natural warmth. - • **Pro-Level Audio Boost:** Ideal for guitar amps or hi-fi setups, delivering smooth breakup at high volumes for that coveted tube distortion. - • **Flexible Power Options:** Supports both DC socket and AC transformer inputs for versatile, hassle-free setup. - • **Noise-Free Power System:** Nine high-capacity capacitors filter power flawlessly, eliminating hum and ensuring crystal-clear audio. - • **DIY Enthusiast’s Dream:** Compact, easy-to-assemble kit perfect for hands-on pros who love customizing their audio gear. ## Overview The 6J1 Valve Preamp is a compact vacuum tube amplifier board designed to add warm, valve-style audio character by filtering digital harshness. Featuring nine 470µF capacitors for clean power and dual DC/AC power inputs, this kit is perfect for audio enthusiasts seeking a noise-free, customizable preamp solution that enhances music and voice clarity with classic tube warmth. ## Description Buy 6J1 Valve Preamp, Vacuum Tube Preamp Valve Preamp Amplifier Board Audio Amp Assortment Kit: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Can’t beat the price. Great little DIY kit! - Just built this little guy last night. It seems to have decent output. I’m currently running it on a larger transformer as I had no small ones. I’m reading 30.1 volts on each of the boost circuit rails coming to 60.2 volts total. The sound seems decent from it. Easy to put together if you have experience in soldering circuit boards. It was worth what I paid for at $14. We’ll see how long it survives. All the circuits are cheap if any blow including the tubes which I’m considering upgrading to 5654W tubes. Review: Itty bitty tube amp. Not bad imho. - This kit is good if you have some circuit board experience under your belt. No instructions, but a few other kits taught me you go small to large in order of soldering, Diodes, Resistors, Small caps, tube carraige, In/Out, DC in, then finally your big caps. As far as sound quality, it works best at 50%. It starts to break up when dimed. Which is what you want for guitar amplification, so I'm going to do that with mine. ## Features - ★ Application 』- Connect the 6J1 tube pre-amp between sound source and amplifier, it will effectively filter digital flavor. Tube amplifier produces a warmer or more valve sound, make music and human voice is relatively good. - ★ 『Function』 - Using DC 5.5 * 2.5 socket and AC 12V transformer, you can also use AC 12V transformer without plug, just need to weld the power cord onto the circuit board. - ★ 『9 Pcs』 -9 Pcs 50V 470UF capacitor filter is very clean, excellent power system to no hum, filaments are powered with AC 12V and need to be connected in series in order to reduce noise. - ★ 『Feature』 -Excellent power supply system to ensure that the Nine 470UF capacitor filter clean, tube filament is connected in series, DC 12V power supply, reducing noise. - ★ 『Electrodeless』 -Coupling capacitor is electrodeless electrolytic. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07RZHSFZP | | Best Sellers Rank | #263,253 in Electronics ( See Top 100 in Electronics ) #1,571 in Audio Component Amplifiers | | Date First Available | May 20, 2019 | | Item Weight | 3.17 ounces | | Item model number | Yanmis5732e8whnv | | Manufacturer | Yanmis | | Product Dimensions | 5.12 x 3.94 x 0.98 inches | ## Images ![6J1 Valve Preamp, Vacuum Tube Preamp Valve Preamp Amplifier Board Audio Amp Assortment Kit - Image 1](https://m.media-amazon.com/images/I/61Au0xhIUVL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Can’t beat the price. Great little DIY kit! *by M***E on February 20, 2026* Just built this little guy last night. It seems to have decent output. I’m currently running it on a larger transformer as I had no small ones. I’m reading 30.1 volts on each of the boost circuit rails coming to 60.2 volts total. The sound seems decent from it. Easy to put together if you have experience in soldering circuit boards. It was worth what I paid for at $14. We’ll see how long it survives. All the circuits are cheap if any blow including the tubes which I’m considering upgrading to 5654W tubes. ### ⭐⭐⭐⭐ Itty bitty tube amp. Not bad imho. *by K***M on April 3, 2025* This kit is good if you have some circuit board experience under your belt. No instructions, but a few other kits taught me you go small to large in order of soldering, Diodes, Resistors, Small caps, tube carraige, In/Out, DC in, then finally your big caps. As far as sound quality, it works best at 50%. It starts to break up when dimed. Which is what you want for guitar amplification, so I'm going to do that with mine. ### ⭐⭐⭐⭐⭐ Amazing sound for a little $17 circuit *by P***T on October 8, 2023* Trying to avoid using terms like "warm," this little circuit produces all the transparency and clarity one would expect from a tube amp. After all, most of the tube amp magic happens in the preamp stage. Every element within the mix is more audible, without being overly dominant or blaring. Yes it's counterintuitive for inherently noisy tubes to sound more clear than transistors. But CD quality digital audio must be dithered. The intentional injection of noise. Clearing up any confusion surrounding capacitor polarity: inside the silkscreened circles marking where the electrolytic caps are placed, the negative lead should ALWAYS go in the hole marked with the series of stripes. No doubt those of you ohming out the solder pads will say, "Hold on! Half the pads without the stripes are connected to ground." That's because this board uses both positive and negative voltage. The caps receiving negative voltage will see the ground as positive voltage. Positive compared to the negative voltage on the negative lead. So connecting the positive lead to ground is in fact proper. If anybody is unclear, a polarized electrolytic capacitor connected backward will in fact explode. As at least one reviewer has reported. If anyone is having trouble finding a 12VAC power adapter, a DC adapter can be fairly easily converted to AC. Provided it has a transformer. Most modern power adapters are no longer built around transformers. They simply rectify the voltage to DC, and regulate it down to the desired output voltage. The trick in conversion is to disconnect and bypass the rectifier circuitry. Connecting the output cable directly to the transformer output. ## Frequently Bought Together - 6J1 Valve Preamp, Vacuum Electrom Tube Preamp Valve Preamp Amplifier Board Audio Amp Assortment Musical Fidelity Kit - Enclosure Protection Parts Kit Tube Preamp Box, Vacuum Tube Preamp Box, for 6J1 Valve Preamp Board - NE5532 Amplifier Kit Stereo Preamplifier Volume Control Board with Treble Midrange and Bass Tone Controls DIY Kit Preamp Module --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/153458208-6j1-valve-preamp-vacuum-tube-preamp-valve-preamp-amplifier-board](https://www.desertcart.us/products/153458208-6j1-valve-preamp-vacuum-tube-preamp-valve-preamp-amplifier-board) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-20*