Welcome to my Webspace

A quick Musical Bio.

My first concert at AMS - Sousaphone - 1972

Played Electric Bass in High School Jazz Band - 1978 to 1979

Me and my Gianinni AWN-20 3/4 Student Guitar - 1981

Twice Arian Music Award Recipient 79' & 80'

I memorized my Music, that made it fun to play

Marching Band as well

Loyal Antilles Pirate

 AHS - Class of 1980

MY EARLY TUBE YEARS

First Tube Amp

Pulled from a Dictograph Mono 6V6 Console

Detailed specifications on RadioMuseum Website (link below)

https://www.radiomuseum.org/r/dictograph_10w_amplifier_chassis.html

ELECTRICAL ENGINEER - P.E.

BSEE - Class of 1986

Now, let's enter a wonderful realm of Tubes and Music

Open your Doors of "Tube Perception"

TDoor #1 - Hand Made Equipment

    

Door #2 - Classic Gear Repair/Schematics

   

Door #3 - Loudspeakers

Door #4 - What are Tube Amps?

   

Door #5 - Modifications & Side Projects

   

Door #6 - Contact Information

   

Door #7 - Electrical Hazard Notice

   

Door #8 - Basic Tube Measurements

 

My "most popular" Power Tube Reviews

Audio Applications

Sometimes these are used for Voltage Regulation Duty (OMG!)

I will upload more YouTube Videos of my DIY amps soon

KT-88/6550 - Cavernous lows & very polite highs, trash metal crunch, surprisingly good with Horns

KT-66/6L6/5881* - Layered, tonal Tube, great for HiFi & Guitar, many nice variants

SPECIAL HONORABLE MENTION IS THE 7355 TUBE* (RIP) - Small 6L6 variant, brilliant design, out of production (eg. Harman Kardon)

KT-77/EL34/6CA7 - Midrange Guitar screamer, with a good edge, crystal clear HiFi, nuanced

EL-84/6BQ5 - Musically engaging, great with Classical music, smooth operator, vocals crisp and clean

7591/7591A/7868/6GM5 - Sweet sound, deceivingly smooth at high power, current production Russian

7027A - Nice Warm but Detailed sound, used when Tubes roamed the earth (RIP)

8417- Audio Power Pentode, late bloomer, akin to a V8 and Oil Price Hikes, long out of production (RIP)

6F6 Russian - Old Car Radios, absolutely fabulous tonality, best kept DIY secret (US RIP), listen...

https://www.youtube.com/watch?v=bTS7HkzkWhE

6V6/7408 - Lighter version of 6F6, filaments not as hungry, can be bright at times, glassy

6AQ5 - Mini 6V6 in most regards (RIP) out of production

6CM6 - (RIP) also out of production, fantastic Jazz and Vocal, listen...

https://www.youtube.com/watch?v=zrj1FGQ7e5Y&t=1s

E80L/6227 - European 9 Pin Pentode. 10,000 hour PQ version, on my short list of tubes to use

2A3 - Glorious Single Ended Holography - L.S..D. friendly I suppose

300B - The trusted voice of pure Class A - the golden S.E. standard - Expen$ive

Common Small Signal Voltage Stage Gain Tubes

Line Stages, Tone Controls, Phase Splitters & Buffers

ECC83/12AX7 - High-Mu, Dual Triode everyone knows something about

ECC81/12AT7 - Medium-Mu Dual Triode, common in Guitar amps, seen in HiFi amps (Fisher SA300)

ECC82/12AU7 - A true chameleon, Low-Mu, versatile, ubiquitous, handy

12DW7/7247 - Half of a 12AX7 plus Half of a 12AU7cool tube (Dynaco S35, EICO 2036)

ECC88/6DJ8/6922 - Frame Grid design, with a Love/Hate HiFi reputation, love 'em HOT (Audible Illusions)

ECC85 - Used sparingly in Audio, very sweet, much more common in German Amps

EF86/6267 - A small Pentode Tube, everyone needs to listen to, most never have (Mullard 5-20)

6C4 - This is half of a 12AU7, small and petite, very cute, used in Hammond AO-28 Preamp (RIP)

6SN7/5962 - The bulldog of Small Signal Gain Stages, robust and musical

6J5 - This just half of a 6SN7 (think 6C4), killer tone, a best kept secret, out of production (RIP)

6N7 - Rare metal audio tube, Stromberg Carlson Theater Amps

6SL7/5961 - Less seen in amps, Cary Audio used them in the 90's (SE300)

12BH7 - Robust dual triode, awesome & beefy, great good driver tube (Hammond AO-28)

ECC99 - The new kid on the block, speaks with an accent, nouveau 12BH7, please use them!

6C45P - A best kept secret for Phono Stages, used in DIY for those in-the-know (Transcendent Sound)

6N1P - More robust than a ECC88/6DJ8, great driver for DHT Triode Tubes (ShermanAudio Kismet)

7199 - Out of production tube (RIP), Pentode/Triode, Russian version so-so (Dynaco ST70)

6AN8 - Out of production tube (RIP), Pentode/Triode (Dynaco MK3, some Japanese Amps)

DARN TUBE RECTIFIERS

"THE UNFAIR REPUTATION"

NONE OF THE SOLID STATE "SOUND"

NO PLATE STRIPPING (Oh-Lala)

SHOCK ABSORBING, ELASTIC, & RELIABLE (Reliable WTF?)

THE ORIGINAL "SOFT START"

TUBE RECTIFIERS RULE, I LOVE THEM

LOWEST DELAY TIME, PRIOR TO FAST RECOVERY DIODES

GZ34/5AR4 - 5V/2A Superman of tube rectifiers, general purpose (Dynaco ST70)

GZ37 - A somewhat filament hungry 5V/2.8A variant of the GZ34, British, rare & expensive

Type 80 Globe - Paleo Rare Tube Rectifier, too much for me as well, for museums

5Z3 - Also rare, museum stuff, not for DIY, unless there is extreme nostagia

5Y3/5Y3GT - Neutral 5V/2A, very reliable when operated within their maximum ratings, quick-on

6X4 - Lighter 6V/.6A version rectifier, mostly used in Preamps (Scott LC21)

5V4 - Rare now, 5V/2A sweetie, nice for medium powered amps 20 to 30w

12X4 - A 12V/0.6A version of a 6X4, same tube, different filament (Dynaco PAS)

6CA4/EZ81 - Like a 6X4, but not as popular, 1amp, think VOX (Leslie Reverb Cabinets)

5U4/5U4G - Robust Rectifier 5V/3A, tall, dark and handsome (US Navy)

5R4GY - That Sexy glass bottle, 5V/3A often seen with Brown Shorts (JAN)

5R4WGB - Potato Masher Rectifier, totally ready for Dinner and Battle (Military Grade)

6AX5/6X5GT - Popular 50's-60's 5V rectifier, similar to 5Y3 in ratings, 5V/0.6A from the 50's

274B - Western Electric, high end tube, available today, must be nice, Expensive as F, $$$

Common Vintage Amp "mistake"

EL-84/6BQ5 is not always a substitute for 7189

And NEVER replace in an amp designed for 7189 an EL-84/6BQ5

I call this "Cheapskate City"

(Images above are from Duncan's Amps)

http://www.duncanamps.com/

Now back on the subject of the 7189

If you own and operate a pure 7189 amp

There are still a few out there

The Russian 6n14n-EB Tubes are tough as nails

Also if you operate a stock Dynaco ST35 on 123-125 VAC

Use NOS 7189's (RIP) or.. Russian 6n14n-EB tube or.. EL-84M

My ST35 DIY version can safely operate both tubes

Mine sports a "Dual Primary Hammond Plate and Filament Transformer"

At the flip of a switch I can go from 115vac to 125vac

(Same on my Mullard 5-20 amps)

Note: Real US 7189 Tubes are all RIP now, out of production decades ago

The remaining NOS stock out there, is most likely smoked-out

Unless real 7189 Sellers are honest, and have tesed 7189's for sale, in a real circuit

Power Tubes can measure perfect on most Tube Testers, but fail in use

The proof is when you put them in a real amplifier circuit at full operating conditions

Put the light's out and look for RED PLATES

In my experience, the Russian 7189 variant tubes

They don't even break a sweat at 450 Volts DC

SO HERE ARE LINKS TO GOOD 7189 RESOURCES

https://www.antiqueradios.com/forums/viewtopic.php?t=148527

https://www.dougstubes.com/nos-6n14n-eb.html

https://upscaleaudio.com/collections/power-tubes/products/russian-6h14-7189

http://www.mcshanedesign.net/tubes.htm

Here is an awesome video

MR. KEVIN DEAL

"THE HIGH PRIEST OF TUBES"

UPSCALE AUDIO

THE TUBE TABERNACLE

MY GO-TO PLACE FOR EXQUISITE LOW NOISE TUBES

https://youtu.be/Zn1ldpDWYfw

One of the few remaining Dinosaurs, from a Neo-Technic age

When DIY Audio and HiFi ruled

Some Tube Trivia

KT stands for ?

Shhhh... "Kinkless Tetrode"

Google it, good fun

ShermanAudio is fundamentally all about MUSIC

 

Continued appreciation of music, artists and tubes

 

Respecting brilliant desigs and designers

Respecting original schematics

Restoration Roadmaps

 

Designers design

Users enjoy

 

You either drive the Formula 1 Car

Work on them,

Or have earned the knowledge to do both

 

Unless you are a Tube Designer

The best policy is;

 

RESPECT ORIGINAL SCHEMATICS, PLEASE

 

Be wary and skeptical of "the killer modification"

 

Audio Forum advice, can often be misleading and costly

 

Be wary of the dozens of keyboard jockey's

Who know it all and are looking to comment on everything (i.e. Trolls)

Not only in this Hobby, but most of the Internet today

Trolls write with limbic reactionary anger when faced with real knowledge

The type of people who have an opinion about every single Country

But never visited any of them

 

A wise man once said:

"You are not upsetting the person,

You are upsetting their Demons"

 

Note that Mr. Paul Klipsch (RIP)

Paul had a hidden lapel pin, that He would flash

Then came the T-Shirts !!

https://www.klipsch.com/bullshit-slogan-background

SO QUESTION IT ALL

 EVEN WHAT I SAY HERE

MY SKIN IS VERY, VERY, VERY THICK

MY ARMOR CONSISTS OF;

ENGINEERING, MATHEMATICS, TIME, PATIENCE, KNOWLEDGE, KINDNESS & VIRTUE

A shot of my Guitars currently on duty (front to rear)

Giannini GNF-8R CEQ

 Fender Newporter

 Giannini AWN20 (3/4) 1975

 Epiphone Invader Electric

None are expensive intruments

All allow great musical expression

Guitars and Singing are fun

For relaxation and a tolerant audiences :)

 

"Tube Curious" & "Campfire Guitarists"

Welcome Home !

 

Jaco Pastorius (RIP) said;

"Let's Gig"

 

78rpm, 45rpm, 33-1/3rpm, 16rpm

Reel to Reel, Cassettes, EL-Casettes

Betamax, VHS, CD, HDCD, MiniDisk, SACD

DVD, Music DVD, BluRay, Streaming

 

All music formats welcome

 

But the true survivor of Time, the Vinyl Record

The Library of Congress is living proof

 

The LP's will be playable in 500-800 years

When properly archived and stored

There is even an LP on the Voyager Probe

https://voyager.jpl.nasa.gov/golden-record/whats-on-the-record/sounds/

 

Now who said Time-Travel is impossible ? Who said that ?

 

Just insert a VHS tape and press PLAY

Old formats, old books and past history

They transport one back to an original experience

and many lessons forgotten

 

When was a Movie ever better than the Book?

Have we forgotten the power of our imagination?

 

Imperfections, they are part of Art, Science and Humanity

 

Cranky nay-sayers utter

"Tubes Distort"

 

I calmly respond

"Yes they can"

Open receptive minds...

Allow for the safe passage of Open Hearts

International Business Travel Side Note

Presenting the Master Percussionist

Mr. Billy Cobham

One warm Thursday evening many years ago

 I was attending a company business dinner 

Platea - Local Bar - Cuidad de Panama - Casco Viejo

"Palindrome" - "Glass Menagerie"

"One Word" from Birds of Fire, amazing

His music transcends the ordinary

Billy plays from within a parallel universe

E

My Vintage Gear Commandments:

No 'fuzzy' Vintage Preamps allowed

No 'Off Balance-Noisy' Balance Controls

No mistracking Stereo Volume Controls, full stop!

No "ideas" accepted without mathematical proof

No 'hummy-buzzy' vintage equipment

Thou shalt not preach, other than from;

Thou shalt measure and calculate and then prove

Thou shalt listen for, test to isolate, identify, and replace out of tolerance components

Achtung! thou shalt not use or operate "un-molested" vimtage gear, verbotten

Thou shalt read and learn basic electrical theory:

Ohms Law

Thevenin & Norton Theorems

Maintain Calibrated Tube Testers

Make your own custom test jigs

Np Bias allowed except for Screen Voltage or Cathode Current

Do not flame, bite or pertetuate false dogmatic ideas

There is no such thing as 'Evil' Feedback

Safety first

Prevent Electric Shock

& Soldering Iron Burns

Always use Eye Protection

My New Maxi Preamp II - Awesome

 Answers the comon question

"Do they still make Tubes?"

I always offer a Hot Mug

Of Mountain Grown - Pure Puerto Rican Coffee

for visitors to my Music Room

(now located in Rochester, NY)

MY ONLY POLITICAL STATEMENT

P.R. is one of our planet's last remaining Colonies

(Fantasy) ELA = Estado - Libre - Asociado

(Reality) CDC = Colonia - Dependiente - Capturada

https://en.wikipedia.org/wiki/Merchant_Marine_Act_of_1920

Alaska, Hawaii, Guam, Marianas, Puerto Rico, American Samoa, Marshall Islands

PLEASE COLONIES, ORGANIZE TODAY, FORM A UNITED COALITION

PETITION THE UNITED STATES CONGRESS TO

REPEAL THE JONES ACT

JONES ACT IS OBSOLETE

 

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