--- product_id: 27005690 title: "Bias Probe for Octal Base Power Tubes." brand: "eurotubes" price: "€ 73.20" currency: EUR in_stock: true reviews_count: 8 category: "Eurotubes" url: https://www.desertcart.at/products/27005690-bias-probe-for-octal-base-power-tubes store_origin: AT region: Austria --- # Bias Probe for Octal Base Power Tubes. **Brand:** eurotubes **Price:** € 73.20 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** Bias Probe for Octal Base Power Tubes. by eurotubes - **How much does it cost?** € 73.20 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/27005690-bias-probe-for-octal-base-power-tubes) ## Best For - eurotubes enthusiasts ## Why This Product - Trusted eurotubes brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description The Eurotubes Octal Bias Probe measures in DC Milliamps and will work with any Multimeter that can read in DC Milliamps. A Milliamp reading is more accurate because the screen current is not added to the plate current as with other probes that measure in Millivolts. Review: Great Bass Probe? - This is the quality you would expect from Eurotubes. Works great. Long jacket covering the wires. Wires do feel a bit thin. Long cables overall. Duck audio worked just as well but the cable leads were way too short. This is a better option. Review: Simple and Accurate - To start, I had an issue unbeknownst to me with my meter. A Klein mm300 which is a fine meter for the price but, has a lower amperage ceramic fuse on the low current side which was faulty in my case. I emailed Eurotubes through the desertcart support and directly through their website. Less than 30 minutes I received a call from Eddie. (Supurb customer service) He looked up my meter (actually the three of them I had before me) and walked me through troubleshooting the probe itself, which tested just fine. Stayed on the phone with me until I verified my Kleins faulty fuse. Fuse replaced and all is right. Eddie took the time and explained exactly how this probe works, and it's genius is in its simplicity. High quality components and so easy to use. I wouldn't hesitate to use this, ever. Eddie, if you read these desertcart reviews thanks man. I really appreciate you going through it with me. You've got a new customer. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B019PAVXPG | | Best Sellers Rank | #138,191 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #582 in Test Probes & Leads | | Brand | Eurotubes | | Brand Name | Eurotubes | | Color | Black, Red, white | | Customer Reviews | 4.8 out of 5 stars 132 Reviews | | Item Weight | 9.07 g | | Manufacturer | Eurotubes Inc. | | Measurement Type | Multimeter | | Model | Eurotubes Octal Bias Probe | | Part Number | Eurotubes-Octal-Bias-Probe | | Power Source | Corded Electric | | Specification Met | CE, RoHS, UL | | Style | Digital | | Style Name | Digital | | Unit Count | 1 Count | ## Product Details - **Brand:** Eurotubes - **Color:** Black, Red, white - **Item Weight:** 0.02 Pounds - **Power Source:** Corded Electric - **Style:** Digital ## Images ![Bias Probe for Octal Base Power Tubes. - Image 1](https://m.media-amazon.com/images/I/71nlOkb8YoL.jpg) ## Questions & Answers **Q: how do you use this? my amp has no bias pots only can be bias from underneath the amp. will this work** A: Our bias probe allows you to monitor the idle bias point (plate current) of your power tubes. The bias point itself can only be adjusted by the bias adjustment trimmer built into the amp. If the bias adjustment trimmer is internal the amp will still need to be taken apart to access it (which is quite common). Thanks,EddieEurotubes503-659-7401 **Q: Will this work for my '65 Deluxe Reverb Reissue?** A: Yes, our octal bias probe would work great with your '65 Deluxe Reverb Reissue. Don't hesitate to contact us directly if you need additional info. Thanks, ET **Q: I use to have these years ago for my deluxe reverb is it true that I can measure the plate voltage with these** A: No, our basic bias probe cannot be used to measure plate voltage. Please checkout or Pro One if you need this functionality: https://www.amazon.com/Eurotubes-Probe-Octal-Power-Tubes/dp/B01A7IKTA0/ref=sr_1_1?ie=UTF8&qid=1524269945&sr=8-1&keywords=eurotubes+pro+one Thanks, Eddie/Eurotubes **Q: will the work with the 7591a tube?** A: Yes, this bias probe head will work 7591A's. Don't hesitate to contact us directly if you would like more info. Thanks, Eurotubes ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Bass Probe? *by J***S on April 13, 2026* This is the quality you would expect from Eurotubes. Works great. Long jacket covering the wires. Wires do feel a bit thin. Long cables overall. Duck audio worked just as well but the cable leads were way too short. This is a better option. ### ⭐⭐⭐⭐⭐ Simple and Accurate *by J***L on September 30, 2022* To start, I had an issue unbeknownst to me with my meter. A Klein mm300 which is a fine meter for the price but, has a lower amperage ceramic fuse on the low current side which was faulty in my case. I emailed Eurotubes through the Amazon support and directly through their website. Less than 30 minutes I received a call from Eddie. (Supurb customer service) He looked up my meter (actually the three of them I had before me) and walked me through troubleshooting the probe itself, which tested just fine. Stayed on the phone with me until I verified my Kleins faulty fuse. Fuse replaced and all is right. Eddie took the time and explained exactly how this probe works, and it's genius is in its simplicity. High quality components and so easy to use. I wouldn't hesitate to use this, ever. Eddie, if you read these Amazon reviews thanks man. I really appreciate you going through it with me. You've got a new customer. ### ⭐⭐⭐⭐⭐ I am biased. I really like these. *by T***R on December 3, 2017* I used cathode biased amps for a long time and never had to worry much about biasing but after recently purchasing a '68 Custom DR I found myself back in the adjustable fixed bias world. A couple of these made the task of biasing that amp quick, easy, and safe. You could probably get by with just one but having two makes switching between tubes quicker. Of course, getting a bias meter that accommodates two or four probes would be the ultimate in convenience but I'm not an amp tech biasing amps every day so for me it's not worth the extra scratch. These work fine for my needs. Just be sure to read the instructions about how to safely use them with your multi-meter. ## Frequently Bought Together - Eurotubes Bias Probe for Octal Base Power Tubes. - AstroAI Digital Multimeter Tester 2000 Counts with DC AC Voltmeter and Ohm Volt Amp Meter; Measures Voltage, Current, Resistance, Continuity and Diode, Blue - WGGE WG-026 10 Pieces and 5 Colors Test Lead Set & Alligator Clips,20.5 inches / 22 AWG Copper Wire. The Clips soldered and Stamping to The Wires. (1 Pack) --- ## 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.at/products/27005690-bias-probe-for-octal-base-power-tubes](https://www.desertcart.at/products/27005690-bias-probe-for-octal-base-power-tubes) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-08-17*