THANK YOU!…………………………………………

A long time customer writes:


“A funny thing happened on my way to buy a McIntosh MC-240 stereo tube amplifier.  I knew exactly where I was going to purchase my vintage tube amplifier; Classic Tube Audio.  I have been working with Pat Hickman, Head Tubeologist, at Classic Tube Audio for more than a decade with Pat bringing my C-28 Preamp to factory perfection, he then worked on my MR-78 followed by my Thorens TD-125 turntable.  While looking at the 240 I noticed there was a pair of sorry looking McIntosh MC-30’s on the floor.  My very first McIntosh system included a pair of MC-30’s and I immediately remembered the warm beautiful sound the 30’s produced.  They were in pretty bad shape but I told Pat the story of my first really good stereo.  Pat volunteered that we could switch the project to the MC-30’s and I immediately jumped on the offer.  What a wonderful decision!  Pat brought this pair of sorry looking monoblock amps to perfection.  All visible areas were addressed; transformers were expertly brought to perfection including filling in any dents or dings with Bondo, sanded, primed and painted.  The transformers were top-offed with absolutely accurate decals, the epitome of attention to details.  What turned these MC-30’s into the beautiful amps are the addition of new chrome chasis with correct decals.  They just gleam in the their perfection. Every detail to match high quality capacitors, tubes, and all new components so that the closest matches were distributed between the two amps.  This makes a tremendous sonic equality between the amps.  To sum it all up the amps are visibly and electronically equal.  Like everything Pat does these amps were returned to perfection.  They look like brand new MC-30 monoblock amplifiers.  I do have a history of McIntosh amps that include my MC-2105 to the behemoth of all amps a MC-2300 that gives me a unique outlook on sound quality.
I worked in the Audio Industry initially as the owner of Quicksilver Audio repair shop in the House Of Music in Salt Lake City, Utah.  I quickly found that with my electronic technician education (ATN) in the U.S. Navy and ability to listen well I was a formidable audio salesman.  I quickly became a top salesman and later the Manager of The House Of Music.  The pinnacle of my audio career culminated in 3 day trip to McIntosh in Binghamton, NY.  Each day we were expertly guided on the many facets of McIntosh Laboratories by Gordon Gow.  We saw manufacturing, speaker research, marketing support, got to meet Frank McIntosh and every other facet of operations.  After the guided tour the evening was spent with Gordon Gow dining on Haute Cuisine followed by nightcaps back in the hotel.  The evening nightcap sessions were the liveliest and most informative sessions of the day.
The majority of my career was spent in the Personal Computer industry ranging from retail sales, software support finalizing in my 20+ year career at Central Washington University Computer Support Services.  My computer career only heightened my appreciation for vintage audio equipment with the introduction to digital music.  While opening many technologies digital advances always came at the expense of fidelity.  The pure sound of vinyl produced by tube technology became even more important in my quest for a really good sound system.
I’ve found that the value of power output has been become extremely corrupted with systems reporting output in the thousands of watts per channel.  One only has to sit down and listen to a whopping 4.2 watts of pure sonic perfection produced by the Whammerdyne “Truth” amplifier to understand fidelity wins every time over wattage.
I know that I have ingredients to build a sonically excellent system.  I owe so much of this to the wonderful advice and mentoring Pat Hickman has provided during our personal/professional friendship.  “Glowing Tubes All in a Row perfection”
A heartfelt thank you, Lynn
Dr Tubeology

The Holy Grail of Marantz Tube components (NOW SOLD)

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The Holy Grail of Marantz tube components have arrived in my shop. ( I will be taking this post down soon, this package just SOLD, January 5th 2017)

This will be sold only as a full set

(2) Marantz model 2 amplifiers (These are cosmetically mint and close serial numbers)
(2) Marantz Model 1 Consolette pre-amplifiers (These are cosmetically mint and close serial numbers)
(1) Marantz model 6 (this is the accessory unit that ties the two mono pre-amplifiers together to work as one stereo pre-amplifier (Cosmetically mint)

(2) power supplies for the Model one pre-amplifiers (MINT) not pictured

Price for package restored $ 20,000 FIRM

This is one of the nicest and most mint sets I have had in years!    serious inquiries only

The above is now sold , but I wanted to leave the post up for a while to show the fine components I get in the shop, I will be expanding this website in the year 2017 this will include an easy to see and view posted (page specific) on each component I get in and place up for sale. Please remember me when any of your vintage components need repairs or restoration too.


This Marantz set sold only as a set ( I will be taking this post down soon, this package just SOLD, Dec 23, 2016)

(1) Marantz 8B amplifier (This is close to Mint just a few very small pint nicks) functions perfect, never serviced                                                 (1) Marantz 7C pre-amplifier (This is very close to mint, note some tiny what appears to be light finger nail scratches at knob  selector areas and some very tiny (not visible a foot away) cosmetically abut a 9.5 will clean up nice. never serviced its original                                                                                                                                                                                                                                                                                                         (1) Marantz 10B tuner (This will be getting a new face dial glass, otherwise its face-plate is near mint and chassis is  not corroded it looks new) come with cabinet

This group above is being sold as a set for $ 9995.00

I will carefully pack each unit and insure via FedEx as the shipper USA shipping destination only, buyer will incur packing and shipping insurance costs

Payment only by Bank Cashiers Check or Certified Bank Check (verifiable) all funds must arrive in advance and clear before shipping out

Please contact me for any questions details and more information about these very rare Marantz Components

The above is now sold , but I wanted to leave the post up for a while to show the fine components I get in the shop, I will be expanding this website in the year 2017 this will include an easy to see and view posted (page specific) on each component I get in and place up for sale. Please remember me when any of your vintage components need repairs or restoration too.

Cheers, Dr. Tubeology




Recent feedback from a customer

Pat, I’ve spent the last week listening to the Marantz 5’s every day.  Paired with the Model 7 pre, 10 tuner, Garrard 301 and Altec Carmel speakers, this system sounds better than any I’ve heard till now.  I’m extremely impressed with the tone and clarity from the amps and just fantastic presence in vocals and instruments.  I love the vintage sound (tone) with clarity I’ve come to expect from high end equipment.  I actually think I may prefer this sound to the more modern SET Shindo and Thoress I have in my main system.  Thank you for all the work that you did on these amps and you have one very happy customer for life.

David A


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Changes on the wind………………………….

Classic Tube Audio is growing!, now gong into our 44 th year, our shop work space is busting at the seams. You know what that means ?, cleaning up and reorganizing it’s just not working anymore. So with that said a new shop is in order and in the works over the next 60 days we are constructing our dream lab.

I will be sacrificing a lot of electronics in the process, I do not wish to move all this heavy electronics audio inventory. Below is a partial list. no sane offer refused. Yes sane, do not insult me or yourself by being a low-baller. I will tell you to go pound sand.. Ha Ha. But if you are fair with me I will be in kind to you.

As we move toward the build out of the shop I will post progress reports. With the new shop comes changes with me I will be spending a lot more time on the bench so I will be expanding my offerings service wise taking in more work. Turnaround times will improve, as to quality of work no changes we already are #1 top rated in the good old USA we live and breathe vacuum tube Hi-Fi, new old in-between………

Dr Tubeology

Tube whisperer

New Arrivals, 
1)     McIntosh 2505 stereo amplifier, just serviced works perfect clean and in great condition $ 900.00

 1)     Pair Marantz Model 5 Tube mono-Block amplifiers EL 34   Tube (RARE) As-Is non restored, SOLD 8-2016

1)     McIntosh Model MC30 mono amplifier (Tube)

1)     McIntosh C8 Mono Pre-amplifier (Tube) ($ 395.00 as-is)



Very Rare Audiophile Amplifiers:


1) Futterman OTL 3 Complete (mono-bloc pair) restored and for sale (RARE) $ 2500.00 the pair (SOLD 8-2016)

(just changed the price as I installed a better set of close matched output tubes and also did a few circuit revisions, they are functioning better than new!, I was able to lower the distortion even more with some additional bypassing of the power supply)


1) Mr. Liang 845 amplifier ($ 500.00) Mint and functions perfect

2) McIntosh C20 pre-amplifier (1) sold 4/2016) (2nd one SOLD 8-2016)

1) McIntosh MR65B FM Stereo tuner (Ready to go and complete with original packing and box and documents)

1) Celestion SL600 bookshelf speakers (Pair)rough (Sold 7-2-2016)

1) Marantz 10B FM Stereo tuner (This will go into Q for full rebuild) ($ 2000.00)

1) Adcom GTP500 stereo Pre-Amplifier/Tuner/With phono (150.00)

1) Linn Basik LV X arm looks to be (new in box) with new Linn cartridge in headshell $ 600.00

1) McIntosh MC275 (to restore yet with new chassis and rebuilt electronics $ 4,000) or as is $ 2500.00 (SOLD)

3) McIntosh MR71 (One sold 5/2016 (2nd sold 6/2016) (1) Left, its in ok condition about a 4 on the scale, $ 150.00 as is

1) Marantz Model 8b Stereo Tube Amplifier (as-is $ 1500.00)

3) McIntosh MC240’s (2 sold 03-2016)(one sold 04-2016) 3 left

4) McIntosh MC30’s (2 sold 3-2016)

1) McIntosh C20 ($ 2100.00) (Near mint) all documents Never touched as it was originally works perfect

2) McIntosh MC2505 (MINT, 10 on the scale fully 100% operating $ 1100.00) (One Sold 5/2016), One I’m servicing, last one ready to go 8-8-2016
1) McIntosh 2505 stereo amplifier, just serviced works perfect clean and in great condition $ 900.00

2) McIntosh MR67

1) McIntosh 1700 (near mint $ 700.00) SOLD 8-8-2016

3) McIntosh C24, C26, C28 (1 each) (1 c26 sold 03-2016)

1) McIntosh MR500

1) McIntosh MR78 (gets new face glass and re-aligned $ 1100.00)

2) McIntosh MR74 (Sold 6-30-16) One MR74 left condition is 7.0 works fine

1) McIntosh MR500 Stereo FM Tuner

1) McIntosh MC2155 Stereo Power Amplifier ($ 1,000.00)

2) McIntosh MR 65 FM Stereo Tuner

1) Dual (United Audio) 1015 Turntable as is not tested, clean with manual (as-is $ 120.00)

1) Linn Sondek LP-12 Turntable with Ittok IV arm and Koestu Rosewood signature cartridge ($ 3500.00)

1) Michell “Micro” Turntable with Rega RB300 arm and Sumiko nude bluepoint (1200.00)

1)     Mono Marantz model 5 tube amplifier untested EL34 Tube clean (as-is 1500.00)


In the Q for rebuild

1) McIntosh C29 pre-amplifier, now in process

 More Hi-End and Audiophile electronics

 1) Pair Zu “Omen” larger book shelf speakers (no longer using I upgraded to large Zu’s) See website for details MINT $ 900.00

1) Bi-Frost DAC (Digital to analog converter) Mint with all UBER upgrades MINT $ 550.00

1) iFi Nano USB DAC mint all boxes and materials) $ 150.00 near brand new


 Many of the components offered are used in good working condition and bench checked (Trade-in’s and upgrades) My service is personal, professional and attentive, by appointment only. Please email me and I will be happy to follow up with you and set an appointment.

 See my extensive service and repair offerings on Craig’s list: Service’s offered (Small business ads section) check me out at:

Also Facebook at:

 **Our new offering is a home grown “Ultimate” 2A3 Vacuum Tube amplifier called the Truth; please see our direct website for more about this world class amplifier:, This year’s highlights. The CAS Stereo show in SF and received accolades as one of the best sounding systems at the show, Stereophile mentioned us as one of the top sounding systems, The Audio Traveler, noted at THE Show in Newport we were a show stopper. The NY Audio show, we just received the “Gold” award for one of the best sound rooms at the show. Soon to be revealed, “Product of the Year 2105” with a full review from

an internationally recognized hi-end audio publication, Tone Audio magazine’s premiere hard copy “printed” edition 


RARE !!!! McIntosh 50W-2 Amplifier RARE !!!!

Here up for sale just as we received it. This was in dry and unused storage for ?.. decades as far as I can tell. It was shipped to me in unknown operational condition. I have installed good test old stock tubes some original McIntosh branded and a new grounded power cord. I have slowly powered up on a variac. I found that I had some slight hum noise from the power supply and I have installed a temporary under chassis electrolytic cap to minimize the hum and get clean DC It’s near dead quiet now, the unit has now been run at full power and plays fine with no issues found. I would recommend that the power supply electrolytic’s be replaced if a person wishes to use this as a daily music amplifier.This unit is clean for its age. Some light scrapes and light dings, along with some paint wear as evident in the photos on the main amplifier chassis. This model was produced from 1951 – 1955 a total of 3068 units were produced. This units serial number is worn off by some past persons cleaning. The early McIntosh logos are clean and bright with very minor damage.It is sold as is, but functional. A McIntosh classic, this is the second model series that McIntosh ever produced.Price firm plus shipping $ 1500.00. (Original owners manual included) Just to mention how rare this is, This is only the third one I have seen in 31 years

Allied Knight-Kit km-15 mono amps X 2

I traded a 18 watt Marshall Clone amp for a pair of these super rare unbuilt Allied Knight-Kit KM-15 mono amps. The KM-15 is a small push pull amp. It has 2 inputs, a phono and tuner, and is rated at 12 watts RMS. The KM-15 uses a two 12ax7 tubes for the pre-amp and phase splitter, and 2 el84 (6bq5) tubes for the power amp section; and for rectification it uses a EZ81(6ca4) tube. See specs below.

As stated above these are un-built and came with everything as they did from the factory with the exception of the tubes. Someone went in and swapped out the original Mullard tubes and replaced them with some Sovtek (they are dated Jan, 1999 so they are even NOS at this point.

Now for the big question do I build them, or put them on Ebay? Part of me wants to build a vintage kit, I think it would be a hoot, on the other hand I have plenty of amps and have rebuilt several kit amps such as this pair of Heathkit w5m’s. – what should I do? Reply in the comments below.

And if you want to buy them and build them make me an offer.

new in box Knight-Kit KM15

I just opened the box

All the parts to build a pair of Knight Kit KM-15 mono amps - Mint and Un-Built

All the parts to build a pair of Knight Kit KM-15 mono amps – Mint and Un-Built

a close up of the chassis, mint original paint job

a close up of the chassis, mint original paint job


KM-15 Knight Kit amp new in box

All of the parts including the wire and hardware are still in neat little plastic bags with the Allied Knight Logo printed on them

Knight Kit KM-15

Inputs Tuner Input and Phono Input
Rated Power 12 Watts Continuous Sine-wave; 14watts IHMF
Peak Power 24 Watts; 48 Watts IHMF
Frequency Response + or – 1 1/2 db 30 to 15,000 cycles at 6 watts
Harmonic Distortion less than 1% at 12 watt, at 1kc (through the tuner input; Tone control settings normal)
Hum and Noise Better than 65db below 12 watts referred to 1 volt input at Tuner;Better than 45db below 12 watts, referred to 10mv input at Phono
Power Sensitivety 5mv at Phono input for 12 watts output1 volt at Tuner input for 12 watts output
Feedback 15db negative feedback
Controls Bass control: 9db of bass boost or cut at 40cpsTreble control: 9db of treble boost or cut at 10kcTuner or Phono selector switch

Volume control

Output inpedances 4, 8, and 16 ohm
Tube Complement 2 – el84/6bq62 – 12ax7 / ECC831 EZ81/6CA4 Rectifier
Power Consumption 50 Watts at 117 Volts, 60 cycle AC
Dimensions 5″ High, 91/2″ Wide, 6″ Deep