Loading...

Positive Feedback Logo

Breaking news! Bumblebee capacitors ride again - hooray!


After discussing this topic in a couple comments with capacitor guru Daryl Stahler, I wanted to follow up with a proper post to give this exciting news more visibility in case you didn't read it in the comments. To reiterate what I said in my comment: I want to let you know some more interesting... Read More »


Almarro A205A EL84 Integrated Amplifier Duelund Coupling Cap Mod. Update x 2.


I've been using the sweet little Almarro A205A EL84 integrated amplifier to power my vintage Altec 832A Corona loudspeakers that I'm using in my bedroom system, and it's a really nice match for them. The volume pot has been kind of noisy in the A205A so I thought I'd pop the bottom off and squirt... Read More »


A Guest Article from Mr. Shirokazu Yazaki: “My Adventure With My Old Marantz Model 7” Part 6!


It is always a pleasure to bring you posts from Yazaki-san for his article “My Adventure With My Old Marantz Model 7”. Thank you, Yazaki-san, for taking time to write this article and share your substantial audio wisdom with us, it is very much appreciated by me, as well as all of us here at Jeff’s... Read More »


A Guest Article from Mr. Shirokazu Yazaki: “My Adventure With My Old Marantz Model 7” Part 3.


It is my great pleasure to bring you the third post for the article that Yazaki-san is writing for us, “My Adventure With My Old Marantz Model 7”. Many thanks to Yazaki-san for taking time to write this article and share his wisdom with us, it is very much appreciated by me, as well as all... Read More »


It's cap swap Saturday! OMG, the prototype Duelund CAST Sn-Cu cap's are ... (updated x 2)


I got up this morning and drank an adequate amount of coffee to wash down a slice of Thanksgiving's leftover pumpkin pie for breakfast, while listening to Jazz24 on the Stokowski A7 Voice of the Theatre loudspeakers. Yazaki-san’s superb SPEC RSA-M3 EX Real Sound Amplifier is a perfect match to my Stokowski A7's, giving a musical... Read More »


Breaking News: The Duelund 'surprise' has arrived from Frederik!


I love surprises, and particularly surprises like the ones sent to me by Frederick Carøe at Duelund Coherent Audio in Denmark! When I first opened the box from Frederik, what did I see? I was looking through squinty, blurry eyes, and I was like, "Wow! Frederik sent me a whole box of Cuban cigars! How cool is... Read More »


The Jupiter Condenser 'Red Astron' Capacitors in the MX110Z!


I had intended to spend quite a lot more time listening to the gorgeous sounding vintage Sprague Bumblebee 0.22uF capacitors in the C93 & C95 and C94 & C96 positions of my MX110Z to establish a 'baseline' before trying any more capacitors. The Bumblebee's are my favorites of all the capacitors I've tried in those positions for the MX110Z... Read More »


Today's Fresh Catch: Red "Astron" Style Capacitors from Jupiter Condenser


I have really been having a lot of fun listening to various capacitors in my vintage McIntosh MX110Z tuner-preamplifier. At the moment the vintage Sprague Bumblebees are at the top of my list for capacitors in the C93 & C95 and C94 & C96 positions for my MX110Z for their sheer musical prowess. The half a century old Bumblebees have... Read More »


The Vintage McIntosh MX110Z Adventure Meets Vintage Sprague Bumblebees!


After getting up this fine Saturday morning, while drinking a couple cups of my favorite coffee from Stumptown Coffee Roasters, I set about pulling off the bottom of my vintage vacuum tube McIntosh MX110Z tuner-preamplifier so I could do a little surgery on it. I had two things I wanted to do while under the bonnet, the... Read More »


Today's Fresh Catch: Bumblebees & Tropical Fish


If you read my recent post about tone capacitors you know there are three vintage capacitors that are very highly regarded for their tone, the Sprague Black Beauty, the Sprague Bumblebee, and the Mullard Tropical Fish, and they represent a sort of 'holy trinity' of tone for electric guitarists, as well as being at least partly responsible for the rich, musical tone,... Read More »


The Altec A5 Voice of the Theatre project progresses ... and other stuff! (now with more updates)


I had a nice day of music listening yesterday afternoon with Leo, Pete, and Ron, as we did some listening comparisons with the Altec A5 Voice of the Theatre loudspeakers and their Hiraga-san inspired crossovers. The Jean Hiraga designed crossovers are about as perfect a match to the Altec A5 Voice of the Theatre loudspeakers as one could hope for,... Read More »


Vintage tone, and other stuff.


I've been thinking a lot about tone lately, and in particular, vintage tone. If you look up 'tone' in the dictionary you'll see half a dozen definitions for it, but what I'm referring to when I say 'tone' is more in line with what musician's mean when they say 'tone', and what I think music lovers & audio hobbyists mostly... Read More »


The A5 VOTT Project Commences: Resistors and capacitors, and inductors, oh my!


I am delighted to say that the vintage Altec-Lansing A5 Voice of the Theatre Project is now moving forward again! In the first phase of the project I commissioned Gary Fischer to restore a vintage pair of Altec-Lansing A5 Voice of the Theatre loudspeakers, which I described in three parts: Part 1, Part 2, and Part 3.... Read More »


Jeff's Categories