trinityamps.com

The BASS AMP

The BASS AMP combines the original circuits of the Ampeg B-15NC (1964) as well as the later B-15NF (1965-67). Maintaining these circuits keeps the same gain structure and biasing found in the original B-15N amp designs, preserving their true heritage.

It has two channels each have volume with a ‘Pull Bright’ switch, treble and bass controls. The first channel, NORMAL, from the B-15NF, has the volume control section before the tone stack. The second channel, CASCADE, comes from the B-15NC which has the volume control section after the tone controls.

The power amp section has two switch selectable bias modes - fixed (NF) and cathode (15NC). While 1N4007 solid state rectifier diodes were used for the "NB" configuration, this was not incorporated into this design. This could be built into special builds or user modifications.
The BASS AMP is designed to output approximately 30 watts in cathode bias mode and 40 watts in fixed bias mode.

The tube set used in both the B-15NC and B-15NF is incorporated in the design:
Three 6SL7-GT dual triodes for preamp and phase inverter circuits, two 6L6GC power tubes, and a 5AR4 rectifier. A small change in the phase inverter to power amp coupling capacitors in original B-15Ns from .022uF to .047uF opens things up a bit.

The Output Transformer has a multiple impedance secondary which allows a choice of 4, 8 or 16 ohm speaker loads. The primary impedance is 6800 ohms. There is a 22K negative feedback resistor from the 8 ohm tap.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Will the power transformer cater for UK voltages? 240V

Looks good!
Mark

Want. I'm planning on a TC15 build this winter. Was going to build another company's 50W bass amp for my wife this winter as well, but now my plans have changed...



nick

A kit is planned. We are getting firm quotes from Heyboer on the transformers and our chassis maker.
The transformers will be very heavy so we're not sure people outside of North America will want to pay the shipping. It wont be cheap.
What do you think?

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

See previous post and attachment.

What are you looking at? US$1000 range + s/h? US$1500?



nick

The goal is less than that for a head kit. With overspec non-potted PT, Ampeg design OT, chromed chassis with tube cage, no tubes or cab. Those will be options.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Still want. What are you thinking for availability for kits?

My house remodel might actually be done in time for setting up a new workbench and making this my first new build.




nick

Finalizing OT design with Heyboer, then we'll get a final sample made. We will post a price very soon and start a reservation list.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

I'm over to the States 3-4 times a year, and would pick one up and take it back to the UK, so would be useful if the PT had 240V in there..

Thx,
Mark

Thats a plan. Thanks.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Yup ... ill buy that
as soon as the kit is avalible
im in toronto Shipping shouldnt be bad

Me too, I'm counting down the days to this one being released..

Well Folks, Here we go....We are now taking deposits on orders for this great sounding kit and if you want to be one of the first to have one, please let us know . A Deposit of $300 will secure your place in history!!
As is usual, the Trip Top is overdesigned for very long life and engineered for flexibility. The option to use KT88 is very appealing for live performance. I have heard this amp live and can assure you that the tone quality is there - better than the original based on studio side-by-side comparisons.
Read On and provide your feedback at your soonest convenience!

TRIP TOP AMP DETAILS
Based on several years of vintage Ampeg B15 designs, the Trip Top combines the original circuits of both the Ampeg B-15NC (1964) as well as the later B-15NF (1965-67). The B-15-NF channel has the volume control section before the tone stack and in the B-15-NC channel it is after. Maintaining these circuits keeps the same gain structure and biasing found in the original B-15N amp designs, helping to preserve their true heritage. It also has two power supply settings - Cathode and Fixed bias to provide further tone structure.

But calling it a bass amp is missing half the point. It's an AMAZING guitar amp. It has a different sonority than other Trinity offerings which have a focus on a very smooth but sparkly top end. The Trip Top is the opposite - there's still a nice smooth top end -and plenty of it - but this amp is all about low end girth and grind. It's got a nice big tight booty (even with the bass tone knob on full!) that inspires rocking out down low on the neck with open chords!! Fixed bias has a more forward, clear, present sound... Cathode bias gives it a saggier feel but adds this gorgeous rich high harmonic overtone to everything - really nice for those ringy single coil U2-esque type sounds.

The Trip Top is designed to output approximately 30 watts in cathode bias mode and 40 watts in fixed bias mode.

It has two channels each have Volume with a 'Pull Bright' switch, Treble and Bass controls. The first channel, NORMAL, from the B-15-NF, has the volume control section before the tone stack. The second channel, CASCADE, comes from the B-15-NC which has the volume control section after the tone controls.

The power amp section has two switch selectable bias modes - fixed (B-15NF) and cathode (B-15NC). Solid state rectifier diodes were used for the "NB" configuration, but not incorporated into our design (easy mod).

The Trip Top is designed to output 25-30 watts in cathode bias mode and 35-40 watts in fixed bias mode with 6L6.

The tube set used is 3 - 6SL7-GT dual triodes for preamp and phase inverter, 2 - 6L6GC power tubes and a 5AR4 tube rectifier.

The Overrated Output Transformer has multiple impedance secondary support.
The Overrated Power Transformer has more High Voltage ampacity (300 mA) than the originals and reissues in order to support 6L6 OR KT66 power tubes!

The Trip Top is built using point-to-point wiring using turret board construction for optimal service and reliability. Coupling capacitors and resistors are selected for maximum tone, performance and reliability.

4 – Ampeg B15 amp configurations in One Package
Original Design Ampeg B15s Baxandall Tone Stack design
3 - 6SL7-GT Pre-Amp tube design
3 Inputs including one to ‘Link’ Channels
Pre-Amp Out jack
4, 8, 16 Ohm speaker output
OVERRATED Heyboer Power Transformer with 117 – 234 60 Hz Mains Support
OFF-STANDBY-ON Progressive Power switch
Ability to use of 6L6 as in original OR KT88 Power tubes.
Mirror Finish CHROME Chassis .06 inch thick with silkscreened control labels front and rear
Hum Control Pot for super quiet operation
Optional CNC fabricated Black Powder Coated Tube Cage

KIT FEATURES
What differentiates our kits from others is part quality, fit, documentation and support. Included is all components; Selected SOZO caps; CARBON FILM and CARBON COMPOSITION resistors; SWITCHCRAFT or CLIFF jacks, ALPHA pots, JJ 50/50uf filter cap; Belton Micalex tube sockets, tube retainers & shields; 1/8" thick GP03 Turret Board with large size KEYSTONE Turrets; CARLING switches; high current impedance switches; All 22 gauge hook-up Wire; Pre-twisted 20 gauge heater wire; BELDEN Co-Ax cable; All Mounting hardware, spacers and nuts; 3 Inputs; AMPEG style control knobs; Pre-Cut 0.06" MIRROR FINISH STAINLESS STEEL Chassis with tapped holes for mounting screws; SILK SCREENED Front and Rear chassis labels; Detailed Assembly guide; large 11" X 17" size layout and schematic drawings and REAL Support.

HEYBOER OVERRATED TRANSFORMERS - Also included in the kit package is our custom made Transformer set by Heyboer. It is built to our OVERRATED specifications but based on original AMPEG transformers used in the early B15 amps. The Power transformer is rated at 300 mA compared to under 200mA originals and all other current third party suppliers including Ampeg’s re-issue. The output transformer has 3 Interleaves and heavier gauge winding than originals and multiple secondary windings (4, 8, 16 ohm support). This is an excellent B15 transformer. With our overrated and non-potted iron, you can optionally run KT88 POWER TUBES almost doubling the power output. The Trinity Amps power transformer and output transformer are all custom built and selected for maximum tone, performance and reliability.

To accommodate the DIY Customer, Cabinet and tubes are not included. To purchase tubes we recommend The Tube Store. Great people, great products.

PRICING IN USD
Kit Package $670. Combined shipping for kit package in North America is $40-$60
USD (converted to CAD for non-US residents). Taxes apply to Canadian sales only.

OPTIONS
Full Width Black Powder Coated fabricated Tube Cage - $60
50 Hz Power Transformer Core for Cool Running - $30
Custom head cabinet is available for $280 plus shipping.
Portaflex 15 inch Bass Cab coming soon.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps