Play Video

TELEFUNKEN KT88-TK Power Tubes Quad

Q&A SKU #M17887000000001

$45000

6-Month Special Financing

Limited time Learn more

Special Financing

Applying is fast and easy!
Status and credit amount on validation!
Instant decisions if approved, so you can make your purchase now!

*Qualifying purchase (excluding gift certificates) must be one receipt. 6 month special financing excludes open box gear and cannot be combined with promotional coupons or manual discounts. No interest will be charged on the promo purchase if you pay the promo purchase amount in full within the promotional period. If you do not, interest will be charged on the promo purchase from the purchase date. Depending on purchase amount, promotion length and payment allocation, the required minimum monthly payments may or may not pay off the purchase by the end of the promotional period. Regular account terms apply to non-promotional purchases and, after the promotion ends, to the promotional balance. For new accounts: The Purchase APR is 29.99%; Minimum Interest Charge is $2. Existing cardholders should see their credit card agreement for their applicable terms. Subject to credit approval.

More ways to pay:

Lease-to-own with Progressive Leasing. Learn more

Earn 3,600 reward points

($36.00 in credit)

Earn 3,600 reward pts.

($36.00 in credit)

In Stock & Ready to Ship

Most orders placed before 3 p.m. ET ship same day (except weekends and holidays).

Style: Quad

Quad $450.00 { "name": "Quad", "skuUrl":"/accessories/telefunken-kt88-tk-power-tubes/m17887000000001", "status": "instock", "statusText": "In stock", "pimStatus": "R1", "inventoryText": "In Stock & Ready To Ship", "inventoryKey": "in_stock", "availableDate": "11-27-2025", "price": 450.00, "formatedIntegerValue": "450", "decimalValue": "00", "isOnSale": false, "easyPayOptions":"0,0,300003,6 Months Promotional Financing,12/31/2026,Special 6-month special,450.0,true,/pages/Gear-Card-Rewards.gc,false,106,,/Special-Financing-Offers.gc,{primaryMonths}-month special financing,with no minimum purchase ,{secondaryMonths}-month financing,available on purchase of ${eligibleOrderValue} or more. Limited time,Get Details.,+ ${backInRewardsNum} back in rewards,09/27/2015,No Interest if paid in full within 6 Months* On qualifying purchases made with your Musician's Friend Platinum credit card. Interest will be charged to your account from the purchase date if the promotional purchase is not paid in full within 6 months. Minimum monthly payments required. No interest will be charged on the promo balance if you pay it off|| in full|| within the promo period. If you do not|| interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period|| depending on purchase amount|| promo length and payment allocation. Regular account terms apply to non-promo purchases and|| after promo period ends|| to the promo balance. New Accounts as of 07/31/2025: Purchase APR 34.99%. Penalty APR 39.99%. Min Interest Charge $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval. ", "msrp": 517.50, "salePrice": 450.00, "listPrice": 450.00, "isPriceDrop": false, "priceDropPrice": "", "savingPercent": "0.00", "promos":["freeShipping","flexibleFinancing","guarantee"], "warranty": false, "freeWarrantyAvail": false, "sku": "site1skuM17887000000001", "displaySku": "M17887 000000001", "serialized": false, "downloadable":"false", "shipsFree":true, "condition": "New", "priceVisibility": "", "scene7SetID": "MMGS7/M17887000000001_MEDIA_SET", "inCheckoutPromo":"false", "invMsgVendorDropShip":"false", "invMsgOverSized":"false", "invMsgBackOrdered":"false", "invMsgPreOrder":"false", "invMsgPromiseDate":"", "fakeInvMsgPromiseDate":"", "invMsgAvailability":"In Stock & Ready to Ship", "invMsgDetail":"Most orders placed before 3 p.m. ET ship same day (except weekends and holidays).", "invMsgAddOnText":"", "invMsgCurrent":"In Stock & Ready to Ship", "invMsgAfterCutoff":"", "orderCutoffTime":"Sun Dec 07 08:00:00 PST 2025", "twoDayShippingSourceStatus":"MFI=5", "currencySymbol": "$", "styleImgUrl": "https://media.musiciansfriend.com/is/image/MMGS7/KT88-TK-Power-Tubes-Quad/M17887000000001-00-140x140.jpg", "styleImgAlt": "KT88-TK Power Tubes Quad", "freeGiftWarning":false, "freeGiftWarningTips":"", "kitCarouselItems": [], "pdpLoyaltyPoints":"3,600", "pdpLoyaltyPointsMultiplier":"1.0", "checksum":"301805586000", "restrictionType":"", "restrictionError":"" } Pair $225.00 { "name": "Pair", "skuUrl":"/accessories/telefunken-kt88-tk-power-tubes/m17887000000003", "status": "instock", "statusText": "In stock", "pimStatus": "R1", "inventoryText": "In Stock & Ready To Ship", "inventoryKey": "in_stock", "availableDate": "07-06-2025", "price": 225.00, "formatedIntegerValue": "225", "decimalValue": "00", "isOnSale": false, "easyPayOptions":"0,0,300003,6 Months Promotional Financing,12/31/2026,Special 6-month special,225.0,true,/pages/Gear-Card-Rewards.gc,false,106,,/Special-Financing-Offers.gc,{primaryMonths}-month special financing,with no minimum purchase ,{secondaryMonths}-month financing,available on purchase of ${eligibleOrderValue} or more. Limited time,Get Details.,+ ${backInRewardsNum} back in rewards,09/27/2015,No Interest if paid in full within 6 Months* On qualifying purchases made with your Musician's Friend Platinum credit card. Interest will be charged to your account from the purchase date if the promotional purchase is not paid in full within 6 months. Minimum monthly payments required. No interest will be charged on the promo balance if you pay it off|| in full|| within the promo period. If you do not|| interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period|| depending on purchase amount|| promo length and payment allocation. Regular account terms apply to non-promo purchases and|| after promo period ends|| to the promo balance. New Accounts as of 07/31/2025: Purchase APR 34.99%. Penalty APR 39.99%. Min Interest Charge $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval. ", "msrp": 258.75, "salePrice": 225.00, "listPrice": 225.00, "isPriceDrop": false, "priceDropPrice": "", "savingPercent": "0.00", "promos":["freeShipping","flexibleFinancing","guarantee"],"freeWarrantyAvail": false, "sku": "site1skuM17887000000003", "displaySku": "M17887 000000003", "serialized": false, "downloadable":"false", "shipsFree":true, "condition": "New", "priceVisibility": "", "scene7SetID": "MMGS7/M17887000000003_MEDIA_SET", "inCheckoutPromo":"false", "invMsgVendorDropShip":"false", "invMsgOverSized":"false", "invMsgBackOrdered":"false", "invMsgPreOrder":"false", "invMsgPromiseDate":"", "fakeInvMsgPromiseDate":"", "invMsgAvailability":"In Stock & Ready to Ship", "invMsgDetail":"Estimated delivery 5-8 business days", "invMsgAddOnText":"", "invMsgCurrent":"In Stock & Ready to Ship", "invMsgAfterCutoff":"", "orderCutoffTime":"Sun Dec 07 08:00:00 PST 2025", "twoDayShippingSourceStatus":"", "currencySymbol": "$", "styleImgUrl": "https://media.musiciansfriend.com/is/image/MMGS7/KT88-TK-Power-Tubes-Pair/M17887000000003-00-140x140.jpg", "styleImgAlt": "KT88-TK Power Tubes Pair", "freeGiftWarning":false, "freeGiftWarningTips":"", "kitCarouselItems": [], "pdpLoyaltyPoints":"1,800", "pdpLoyaltyPointsMultiplier":"1.0", "checksum":"150902793000", "restrictionType":"", "restrictionError":"" }

Free Shipping
Flexible Financing
Lowest Price

Overview

Experience the power and clarity of TELEFUNKEN KT88-TK power tubes.

The TELEFUNKEN KT88-TK is a beam-power tetrode vacuum tube renowned for its high power output, low distortion and exceptional tonal quality. Manufactured in collaboration with JJ Electronic of Slovakia, this tube is part of TELEFUNKEN's Black Diamond Series, which emphasizes harmonic richness and tonal balance, making it a premium choice for demanding guitar and hi-fi amplifiers.

High-Power Output and Low Distortion

The KT88-TK is designed to deliver high-power output with minimal distortion, making it an ideal choice for applications that require clean headroom and dynamic range. Its robust construction and TELEFUNKEN's commitment to quality ensure consistent performance and long-lasting durability.

Balanced Tonal Response for a Variety of Applications

The KT88-TK is widely utilized in guitar and hi-fi amplifiers, offering a tight low end, smooth mids and a balanced tonal response. Its versatility makes it suitable for a variety of musical styles and audio applications. Whether you're seeking pristine cleans, crunchy overdrive or smooth, high-gain distortion, the KT88-TK delivers the power and clarity you need.

Order the TELEFUNKEN KT88-TK power tubes today.

Specs

KT88-TK Power Tubes Specifications:

General

Type: Beam-power tetrode
Base: Octal (8-pin)

Electrical

Heater Voltage: 6.3V
Heater Current: 1.6A
Maximum Plate Voltage: 800V
Maximum Plate Dissipation: 42W
Maximum Screen Voltage: 600V
Maximum Screen Dissipation: 8W
Transconductance: 11 mA/V
Amplification Factor: 8

Performance

Plate Resistance: 15 kohm
Typical Operating Conditions:
Plate Voltage: 400V
Screen Voltage: 300V
Control Grid Voltage: -55V
Plate Current: 140 mA
Screen Current: 12 mA
Output Power: 50W (push-pull Class AB1)

Physical

Dimensions: Approximately 4.9" in height and 2.1" in diameter

Other

Applications: Guitar and Hi-Fi amplifiers

Reviews

Q&A

Questions & Answers

Do you have questions about this product?

Shop with a Friend

Free Shipping

Free Standard Ground shipping (48 contiguous states, some overweight and Used/Vintage items excluded).
Orders placed before 3 p.m. ET usually ship the same business day.

Learn More

2-Year Free Warranty on Guitars

Every guitar or bass you purchase from Musician's Friend (electric or acoustic, New or Open Box) includes two years of protection from manufacturer defects.

We're Here for You

Our Gear Advisers are available to guide you through your entire shopping experience. Call or Chat for expert advice and to hear the latest deals.

Your Cart Is Empty

TELEFUNKEN KT88-TK Power Tubes Quad

Special Financing

Musician's Friend Rewards

This oversized item has special shipping requirements