---
product_id: 27005690
title: "Bias Probe for Octal Base Power Tubes."
brand: "eurotubes"
price: "₨22762"
currency: LKR
in_stock: true
reviews_count: 8
category: "Eurotubes"
url: https://www.desertcart.lk/products/27005690-bias-probe-for-octal-base-power-tubes
store_origin: LK
region: Sri Lanka
---

# Bias Probe for Octal Base Power Tubes.

**Brand:** eurotubes
**Price:** ₨22762
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Bias Probe for Octal Base Power Tubes. by eurotubes
- **How much does it cost?** ₨22762 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/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: I am biased. I really like these. - 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.
Review: Super Helpful people - And top quality parts and tools. Eddie has been helping me suss out some issues that I am sure are pedestrian to someone of his vast knowledge and experience in all this, but he's been super cool and patient. In the end, although I have purchased tubes and parts from several outfits over the years, Eurotubes get all my business from now on. I would highly suggest you do the same. A bit of a story here. I have a good friend who for many years custom built some of the best tube amps in the US. He retired from it some yrs back and we lost touch. While attempting to reconnect with him since my amp appeared to be having some minor issues I purchased this Bias Probe from ET to begin testing things myself. Part of my issue was that some of my tubes were new/old stock when the amp was built some 12 yrs ago and some were now unmarked. Long story, short, I lined out the amps "sound" issues with Eddie at Eurotubes and sent him pics of the inside of the amp. While he was researching the issues and considering which tubes I should change to, to achieve more clean headroom, I finally heard back from my old friend Dr. J. Did I mention he worked as an electrical engineer dept head at Los Alamos lab? Yeah, this guy knows more about high-end electronics than most people alive which is why his amps rocked. Additionally, since he had special parts access all those yrs, his amps were built with all Mil-Spec parts which are far superior to anything commercially available in any era. Dr. J lined out a new set of tube types that would get me where I wanted to be, most of the tubes were not exactly what I would have expected. And they were NOT the tube sets that other tube company's advised me to get. My point? When Eddie of Eurotubes got back to me a day or so after that, he advised me to try using the IDENTICAL set of tubes and in the EXACT same locations as my friend Dr. J advised. Now, what does that tell you about Eddie and Eurotubes? It is not often we find "experts" in any field who are actually "experts" outside of their own imaginations. Eddie is one such person and Eurotubes is obviously that as well.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B019PAVXPG |
| Best Sellers Rank | #357,833 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,495 in Test Probes & Leads |
| Brand | Eurotubes |
| Color | Black, Red, white |
| Date First Available | December 22, 2015 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.32 ounces |
| Item model number | Eurotubes Octal Bias Probe |
| Manufacturer | Eurotubes Inc. |
| Measurement Type | Multimeter |
| Power Source | Corded Electric |
| Style | Digital |

## Product Details

- **Brand:** Eurotubes
- **Color:** Black, Red, white
- **Item Weight:** 9.07 g
- **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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Super Helpful people
*by A***S on October 19, 2018*

And top quality parts and tools. Eddie has been helping me suss out some issues that I am sure are pedestrian to someone of his vast knowledge and experience in all this, but he's been super cool and patient. In the end, although I have purchased tubes and parts from several outfits over the years, Eurotubes get all my business from now on. I would highly suggest you do the same. A bit of a story here. I have a good friend who for many years custom built some of the best tube amps in the US. He retired from it some yrs back and we lost touch. While attempting to reconnect with him since my amp appeared to be having some minor issues I purchased this Bias Probe from ET to begin testing things myself. Part of my issue was that some of my tubes were new/old stock when the amp was built some 12 yrs ago and some were now unmarked. Long story, short, I lined out the amps "sound" issues with Eddie at Eurotubes and sent him pics of the inside of the amp. While he was researching the issues and considering which tubes I should change to, to achieve more clean headroom, I finally heard back from my old friend Dr. J. Did I mention he worked as an electrical engineer dept head at Los Alamos lab? Yeah, this guy knows more about high-end electronics than most people alive which is why his amps rocked. Additionally, since he had special parts access all those yrs, his amps were built with all Mil-Spec parts which are far superior to anything commercially available in any era. Dr. J lined out a new set of tube types that would get me where I wanted to be, most of the tubes were not exactly what I would have expected. And they were NOT the tube sets that other tube company's advised me to get. My point? When Eddie of Eurotubes got back to me a day or so after that, he advised me to try using the IDENTICAL set of tubes and in the EXACT same locations as my friend Dr. J advised. Now, what does that tell you about Eddie and Eurotubes? It is not often we find "experts" in any field who are actually "experts" outside of their own imaginations. Eddie is one such person and Eurotubes is obviously that as well.

### ⭐⭐⭐⭐⭐ Very Simple and Effective
*by J***D on March 14, 2020*

I connected this probe to the 2 6V6GT tubes just by removing the 4 screws securing the panel in front of the on my 65 Deluxe Reverb. Did not remove the chassis. I used a mirror to locate the adjustment pot behind a small transformer directly behind the 2 tubes and set the current level to the value on the chart. The values were slightly different so I set the pot exactly in the middle between them. My amp has not sounded this good in years. Well worth it.

## 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.lk/products/27005690-bias-probe-for-octal-base-power-tubes](https://www.desertcart.lk/products/27005690-bias-probe-for-octal-base-power-tubes)

---

*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-01-31*