--- product_id: 14944968 title: "Jetcity RV3B12 3-Pack Analog Vacuum Tube By Roberts Retrovalve - Blue" brand: "jet city amplification" price: "FREE" currency: TND in_stock: false reviews_count: 7 url: https://www.desertcart.tn/products/14944968-jetcity-rv3b12-3-pack-analog-vacuum-tube-by-roberts-retrovalve store_origin: TN region: Tunisia --- # Jetcity RV3B12 3-Pack Analog Vacuum Tube By Roberts Retrovalve - Blue **Brand:** jet city amplification **Price:** FREE **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Jetcity RV3B12 3-Pack Analog Vacuum Tube By Roberts Retrovalve - Blue by jet city amplification - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/14944968-jetcity-rv3b12-3-pack-analog-vacuum-tube-by-roberts-retrovalve) ## Best For - jet city amplification enthusiasts ## Why This Product - Trusted jet city amplification brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description RetroValves are 100% analog vacuum tube replacement devices offering the warm, fat, punchy sound traditionally associated with only glass vacuum tubes. RetroValves are pin-for-pin compatible with 12AX7 tubes in nearly any guitar amplifier, offering instant modification of preamp gain characteristics. Red RetroValves are very high gain, Amber are standard gain and Blue are lower gain, allowing the preamp to achieve gain characteristics not possible with standard vacuum tubes. RetroValves are very low noise and have no potential for the microphonics sometimes characteristic of vacuum tubes. And because RetroValves operate with much less heat and consume less power, they reduce stress on the amplifier's electronics. ## Features - Three Blue (Lower Gain) tubes ## Images ![Jetcity RV3B12 3-Pack Analog Vacuum Tube By Roberts Retrovalve - Blue - Image 1](https://m.media-amazon.com/images/I/415GU2RTDEL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐ They sound better in some applications than in others *by R***N on Reviewed in the United States on March 15, 2015* The vendor timely delivered the product.I've had a a chance to experiment with these Retrovalves in three different guitar amplifiers. I've also been able to move them around into different pre-amp positions. They sound better in some applications than in others. They typically do not challenge the best 12AX7s or 5751s for tone in V1 stages, but they are fine down the line in a pre-amp with cascading gain stages. Some amps take well to them as phase inverters. You just have to experiment and see what they do best for your amp.It is an interesting product that has its place, but I'm not going to use them in my primary tone generating stages over a GE, RCA or some other premium 12AX7 or 5751. ### ⭐⭐⭐⭐⭐ F'N Great *by C***S on Reviewed in the United States on January 23, 2014* UPDATED5stars!!! Brilliant idea, so glad they made them, essential to my gear now. They add a great little gain boost that sounds very analog when mixed with real triodes, and they never die. Just wonderful.4 because the it will take years to see how they hold up. But really great so far. It seems odd diodes for triodes, but it really helps add gain in a very analog way. The blues and yellows work as advertised as well. BIG RECOMEND ### ⭐⭐⭐⭐⭐ some very important applications for these devices! *by A***R on Reviewed in the United States on October 24, 2013* I think these are really important devices for tube amps.I was mostly excited to use these in V1 preamp positions for driving power tubes into saturation. This way you know your preamp wont be microphonic or unreliable. I really like the way it sounds in V1 of my tube amp.A side effect I did not expect was an opening up of tone. Normally my amp seems very mid heavy. I've never been able to dial in much of a scooped mids tone to emulate Fenders. With this, I'm able to do it! Placebo effect? perhaps....another great application is for touring. These would be reliable during the course of a tour. No more tracking down amp techs in unfamiliar towns.I think these could also be good in phase inverter positions, tube buffered effects loops, reverb, trem.I love tubes and hope they can continue to be manufactured forever. by reducing bound to fail components like preamp tubes, we make our amp more reliable and easier to troubleshoot. Middle road FTW! --- ## 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.tn/products/14944968-jetcity-rv3b12-3-pack-analog-vacuum-tube-by-roberts-retrovalve](https://www.desertcart.tn/products/14944968-jetcity-rv3b12-3-pack-analog-vacuum-tube-by-roberts-retrovalve) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-12*